armvirt: set kernel partition as the EFI system partition

U-Boot with EFI boot manager functionality will store
EFI boot order data on the ESP in the ubootefi.var file.

Signed-off-by: Mathew McBride <[email protected]>

target/linux/armvirt/image/Makefile

@@ -45,7 +45,7 @@ define Build/combined
 		$(CP) $(STAGING_DIR_IMAGE)/grub2/boot$(if $(CONFIG_aarch64),aa64,arm).efi [email protected]/efi/openwrt/
 		$(CP) $(STAGING_DIR_IMAGE)/grub2/boot$(if $(CONFIG_aarch64),aa64,arm).efi [email protected]/efi/boot/
 	)
-	FAT_TYPE="32" PADDING="1" SIGNATURE="$(IMG_PART_SIGNATURE)" \
+	KERNELPARTTYPE=ef FAT_TYPE="32" PADDING="1" SIGNATURE="$(IMG_PART_SIGNATURE)" \
 		$(if $(filter $(1),efi),GUID="$(IMG_PART_DISKGUID)") $(SCRIPT_DIR)/gen_image_generic.sh \
 		$@ \
 		$(CONFIG_TARGET_KERNEL_PARTSIZE) [email protected] \