efi: Add uclass for devices provided by UEFI firmware

UCLASS_EFI_LOADER is used for devices created by applications and
drivers loaded by U-Boots UEFI implementation.

This patch provides a new uclass (UCLASS_EFI_MEDIA) to be used for devices
that provided by a UEFI firmware calling U-Boot as an EFI application.

If the two uclasses can be unified, is left to future redesign.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>

include/blk.h

@@ -37,6 +37,7 @@ enum if_type {
 	IF_TYPE_EFI_LOADER,
 	IF_TYPE_PVBLOCK,
 	IF_TYPE_VIRTIO,
+	IF_TYPE_EFI_MEDIA,
 
 	IF_TYPE_COUNT,			/* Number of interface types */
 };