efi_loader: add firmware management protocol for raw image

In this commit, a very simple firmware management protocol driver
is implemented. It will take a binary image in a capsule file and
apply the data using dfu backend storage drivers via dfu_write_by_alt()
interface.

So "dfu_alt_info" variable should be properly set to specify a device
and location to be updated. Please read README.dfu.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
index 33425b7..ea22ee7 100644
--- a/lib/efi_loader/efi_capsule.c
+++ b/lib/efi_loader/efi_capsule.c
@@ -807,6 +807,14 @@
 				&efi_fmp_fit, NULL));
 	}
 
+	if (IS_ENABLED(CONFIG_EFI_CAPSULE_FIRMWARE_RAW)) {
+		handle = NULL;
+		ret = EFI_CALL(efi_install_multiple_protocol_interfaces(
+				&efi_root,
+				&efi_guid_firmware_management_protocol,
+				&efi_fmp_raw, NULL));
+	}
+
 	return ret;
 }