test/py: efi_capsule: test for FIT image capsule

The test can run on sandbox build and it attempts to execute a firmware
update via a capsule-on-disk, using a FIT image capsule,
CONFIG_EFI_CAPSULE_FIT.

To run this test successfully, you need configure U-Boot specifically;
See test_capsule_firmware.py for requirements, and hence it won't run
on Travis CI, at least, for now.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>

tools/mkeficapsule.c

@@ -98,7 +98,8 @@ static int create_fwbin(char *path, char *bin, efi_guid_t *guid,
 	}
 	header.capsule_guid = efi_guid_fm_capsule;
 	header.header_size = sizeof(header);
-	header.flags = CAPSULE_FLAGS_PERSIST_ACROSS_RESET; /* TODO */
+	/* TODO: The current implementation ignores flags */
+	header.flags = CAPSULE_FLAGS_PERSIST_ACROSS_RESET;
 	header.capsule_image_size = sizeof(header)
 					+ sizeof(capsule) + sizeof(u64)
 					+ sizeof(image)