[settings] Clarify usage of the term "named setting"

There are currently two conflicting usages of the term "named setting"
within iPXE: one refers to predefined settings (such as show up in the
"config" UI), the other refers to settings identified by a name (such
as "net0.dhcp/ip").

Split these usages into the term "predefined setting" and "named
setting" to avoid ambiguity.

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

src/arch/i386/interface/vmware/guestinfo.c

 		      strlen ( parent_name ) + 1 /* "." */ +
 		      strlen ( setting->name ) + 1 /* "." */ +
 		      ( type ? strlen ( type->name ) : 0 ) + 1 /* NUL */ ];
-	struct setting *named_setting;
+	struct setting *predefined;
 	char *info;
 	int info_len;
 	int check_len;
 
 	/* Determine default type if necessary */
 	if ( ! type ) {
-		named_setting = find_setting ( setting->name );
-		type = ( named_setting ?
-			 named_setting->type : &setting_type_string );
+		predefined = find_setting ( setting->name );
+		type = ( predefined ? predefined->type : &setting_type_string );
 	}
 	assert ( type != NULL );
 

src/core/settings.c

 }
 
 /**
- * Find child named settings block
+ * Find child settings block
  *
  * @v parent		Parent settings block
  * @v name		Name within this parent
 }
 
 /**
- * Find or create child named settings block
+ * Find or create child settings block
  *
  * @v parent		Parent settings block
  * @v name		Name within this parent
 }
 
 /**
- * Find named settings block
+ * Find settings block
  *
  * @v name		Name
  * @ret settings	Settings block, or NULL
  */
 
 /**
- * Find named setting
+ * Find predefined setting
  *
  * @v name		Name
- * @ret setting		Named setting, or NULL
+ * @ret setting		Setting, or NULL
  */
 struct setting * find_setting ( const char *name ) {
 	struct setting *setting;
 	char *settings_name;
 	char *setting_name;
 	char *type_name;
-	struct setting *named_setting;
+	struct setting *predefined;
 
 	/* Set defaults */
 	*settings = &settings_root;
 	setting->tag = parse_setting_tag ( setting_name );
 	setting->scope = (*settings)->default_scope;
 	setting->name = setting_name;
-	for_each_table_entry ( named_setting, SETTINGS ) {
-		/* Matches a defined named setting; use that setting */
-		if ( setting_cmp ( named_setting, setting ) == 0 ) {
-			memcpy ( setting, named_setting, sizeof ( *setting ) );
+	for_each_table_entry ( predefined, SETTINGS ) {
+		/* Matches a predefined setting; use that setting */
+		if ( setting_cmp ( predefined, setting ) == 0 ) {
+			memcpy ( setting, predefined, sizeof ( *setting ) );
 			break;
 		}
 	}

src/interface/smbios/smbios_settings.c

 	.scope = &smbios_settings_scope,
 };
 
-/** Other SMBIOS named settings */
-struct setting smbios_named_settings[] __setting ( SETTING_HOST_EXTRA ) = {
+/** Other SMBIOS predefined settings */
+struct setting smbios_predefined_settings[] __setting ( SETTING_HOST_EXTRA ) = {
 	{
 		.name = "manufacturer",
 		.description = "Manufacturer",

src/net/netdev_settings.c

  *
  */
 
-/** Network device named settings */
+/** Network device predefined settings */
 struct setting mac_setting __setting ( SETTING_NETDEV ) = {
 	.name = "mac",
 	.description = "MAC address",