efi_loader: efi_net: Add efi_net_do_start() to efi_net.c

This gets called each time a payload is to get executed by bootefi.
For now this only updates the PXE IP address.

Signed-off-by: Adriano Cordova <adriano.cordova@canonical.com>

lib/efi_loader/efi_setup.c

@@ -225,6 +225,9 @@ static efi_status_t efi_start_obj_list(void)
 {
 	efi_status_t ret = EFI_SUCCESS;
 
+	if (IS_ENABLED(CONFIG_NETDEVICES))
+		ret = efi_net_do_start();
+
 	return ret;
 }