[settings] Merge SETTING_IPv4 and SETTING_IPv6

Allow for equivalent IPv4 and IPv6 settings (which requires equivalent
settings to be adjacent within the settings list).

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/core/settings.c

 };
 
 /** Domain name setting */
-const struct setting domain_setting __setting ( SETTING_IPv4_EXTRA, domain ) = {
+const struct setting domain_setting __setting ( SETTING_IP_EXTRA, domain ) = {
 	.name = "domain",
 	.description = "DNS domain",
 	.tag = DHCP_DOMAIN_NAME,

src/include/ipxe/settings.h

 
 #define SETTING_NETDEV		01 /**< Network device settings */
 #define SETTING_NETDEV_EXTRA	02 /**< Network device additional settings */
-#define SETTING_IPv4		03 /**< IPv4 settings */
-#define SETTING_IPv4_EXTRA	04 /**< IPv4 additional settings */
-#define SETTING_IPv6		05 /**< IPv6 settings */
-#define SETTING_IPv6_EXTRA	06 /**< IPv6 additional settings */
-#define SETTING_BOOT		07 /**< Generic boot settings */
-#define SETTING_BOOT_EXTRA	08 /**< Generic boot additional settings */
-#define SETTING_SANBOOT		09 /**< SAN boot settings */
-#define SETTING_SANBOOT_EXTRA	10 /**< SAN boot additional settings */
-#define SETTING_HOST		11 /**< Host identity settings */
-#define SETTING_HOST_EXTRA	12 /**< Host identity additional settings */
-#define SETTING_AUTH		13 /**< Authentication settings */
-#define SETTING_AUTH_EXTRA	14 /**< Authentication additional settings */
-#define SETTING_CRYPTO		15 /**< Cryptography settings */
-#define SETTING_MISC		16 /**< Miscellaneous settings */
+#define SETTING_IP		03 /**< IPv4 settings */
+#define SETTING_IP_EXTRA	04 /**< IPv4 additional settings */
+#define SETTING_BOOT		05 /**< Generic boot settings */
+#define SETTING_BOOT_EXTRA	06 /**< Generic boot additional settings */
+#define SETTING_SANBOOT		07 /**< SAN boot settings */
+#define SETTING_SANBOOT_EXTRA	08 /**< SAN boot additional settings */
+#define SETTING_HOST		09 /**< Host identity settings */
+#define SETTING_HOST_EXTRA	10 /**< Host identity additional settings */
+#define SETTING_AUTH		11 /**< Authentication settings */
+#define SETTING_AUTH_EXTRA	12 /**< Authentication additional settings */
+#define SETTING_CRYPTO		13 /**< Cryptography settings */
+#define SETTING_MISC		14 /**< Miscellaneous settings */
 
 /** @} */
 
 extern const struct setting_type setting_type_busdevfn __setting_type;
 
 extern const struct setting
-ip_setting __setting ( SETTING_IPv4, ip );
+ip_setting __setting ( SETTING_IP, ip );
 extern const struct setting
-netmask_setting __setting ( SETTING_IPv4, netmask );
+netmask_setting __setting ( SETTING_IP, netmask );
 extern const struct setting
-gateway_setting __setting ( SETTING_IPv4, gateway );
+gateway_setting __setting ( SETTING_IP, gateway );
 extern const struct setting
-dns_setting __setting ( SETTING_IPv4_EXTRA, dns );
+dns_setting __setting ( SETTING_IP_EXTRA, dns );
 extern const struct setting
 hostname_setting __setting ( SETTING_HOST, hostname );
 extern const struct setting
-domain_setting __setting ( SETTING_IPv4_EXTRA, domain );
+domain_setting __setting ( SETTING_IP_EXTRA, domain );
 extern const struct setting
 filename_setting __setting ( SETTING_BOOT, filename );
 extern const struct setting

src/net/ipv4.c

 }
 
 /** IPv4 address setting */
-const struct setting ip_setting __setting ( SETTING_IPv4, ip ) = {
+const struct setting ip_setting __setting ( SETTING_IP, ip ) = {
 	.name = "ip",
 	.description = "IP address",
 	.tag = DHCP_EB_YIADDR,
 };
 
 /** IPv4 subnet mask setting */
-const struct setting netmask_setting __setting ( SETTING_IPv4, netmask ) = {
+const struct setting netmask_setting __setting ( SETTING_IP, netmask ) = {
 	.name = "netmask",
 	.description = "Subnet mask",
 	.tag = DHCP_SUBNET_MASK,
 };
 
 /** Default gateway setting */
-const struct setting gateway_setting __setting ( SETTING_IPv4, gateway ) = {
+const struct setting gateway_setting __setting ( SETTING_IP, gateway ) = {
 	.name = "gateway",
 	.description = "Default gateway",
 	.tag = DHCP_ROUTERS,

src/net/udp/dns.c

  */
 
 /** IPv4 DNS server setting */
-const struct setting dns_setting __setting ( SETTING_IPv4_EXTRA, dns ) = {
+const struct setting dns_setting __setting ( SETTING_IP_EXTRA, dns ) = {
 	.name = "dns",
 	.description = "DNS server",
 	.tag = DHCP_DNS_SERVERS,
 };
 
 /** IPv6 DNS server setting */
-const struct setting dns6_setting __setting ( SETTING_IPv6_EXTRA, dns6 ) = {
+const struct setting dns6_setting __setting ( SETTING_IP_EXTRA, dns6 ) = {
 	.name = "dns6",
 	.description = "DNS server",
 	.tag = DHCPV6_DNS_SERVERS,