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/include/efi_loader.h b/include/efi_loader.h
index d592a0e..76cd2b3 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -817,6 +817,7 @@
 u16 *efi_create_indexed_name(u16 *buffer, const char *name, unsigned int index);
 
 extern const struct efi_firmware_management_protocol efi_fmp_fit;
+extern const struct efi_firmware_management_protocol efi_fmp_raw;
 
 /* Capsule update */
 efi_status_t EFIAPI efi_update_capsule(