efi_loader: efi_net: add EFI_IP4_CONFIG2_PROTOCOL

Add an implementation of the EFI_IP4_CONFIG2_PROTOCOL. The protocol
is attached to the handle of the efi network device. This is the same
handle where snp and pxe are attached to.

Signed-off-by: Adriano Cordova <adrianox@gmail.com>
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index 87131ab..30cd1de 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -59,6 +59,7 @@
 obj-$(CONFIG_VIDEO) += efi_gop.o
 obj-$(CONFIG_BLK) += efi_disk.o
 obj-$(CONFIG_NETDEVICES) += efi_net.o
+obj-$(CONFIG_EFI_IP4_CONFIG2_PROTOCOL) += efi_ipconfig.o
 obj-$(CONFIG_ACPI) += efi_acpi.o
 obj-$(CONFIG_SMBIOS) += efi_smbios.o
 obj-$(CONFIG_EFI_RNG_PROTOCOL) += efi_rng.o