efi_loader: export efi_locate_device_handle()

This function will be used in the next commit where some behavior
of EFI boot manager will be expanded.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/include/efi_loader.h b/include/efi_loader.h
index ba79a9a..effb433 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -595,6 +595,10 @@
 void efi_delete_handle(efi_handle_t obj);
 /* Call this to validate a handle and find the EFI object for it */
 struct efi_object *efi_search_obj(const efi_handle_t handle);
+/* Locate device_path handle */
+efi_status_t EFIAPI efi_locate_device_path(const efi_guid_t *protocol,
+					   struct efi_device_path **device_path,
+					   efi_handle_t *device);
 /* Load image */
 efi_status_t EFIAPI efi_load_image(bool boot_policy,
 				   efi_handle_t parent_image,