[infiniband] Make IPoIB support configurable at build time

Add a build configuration option VNIC_IPOIB to control whether or not
IPoIB support is included for Infiniband devices.

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

src/config/config_infiniband.c

 REQUIRE_OBJECT ( ib_srp );
 #endif
 
+/*
+ * Drag in Infiniband-specific virtual network devices
+ */
+#ifdef VNIC_IPOIB
+REQUIRE_OBJECT ( ipoib );
+#endif
+
 /*
  * Drag in Infiniband-specific commands
  */

src/config/general.h

 #undef	NONPNP_HOOK_INT19	/* Hook INT19 on non-PnP BIOSes */
 #define	AUTOBOOT_ROM_FILTER	/* Autoboot only devices matching our ROM */
 
+/*
+ * Virtual network devices
+ *
+ */
+#define VNIC_IPOIB		/* Infiniband IPoIB virtual NICs */
+
 /*
  * Error message tables to include
  *

src/net/infiniband.c

 
 /* Drag in Infiniband configuration */
 REQUIRE_OBJECT ( config_infiniband );
-
-/* Drag in IPoIB */
-REQUIRE_OBJECT ( ipoib );