efi_loader: complete EFI_DEVICE_PATH_UTILITIES_PROTOCOL

The missing services of the EFI_DEVICE_PATH_UTILITIES_PROTOCOL are
implemented.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/include/efi_api.h b/include/efi_api.h
index ae93061..64c27e4 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -343,6 +343,7 @@
 		 0x8e, 0x39, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b )
 
 #define DEVICE_PATH_TYPE_END			0x7f
+#  define DEVICE_PATH_SUB_TYPE_INSTANCE_END	0x01
 #  define DEVICE_PATH_SUB_TYPE_END		0xff
 
 struct efi_device_path {