efi_loader: carve out efi_run_image()

Provide public function efi_run_imager() which can be used to run an UEFI
image from memory.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 3a220893..1e1fe52 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -341,6 +341,8 @@
 
 /* Initialize efi execution environment */
 efi_status_t efi_init_obj_list(void);
+/* Run loaded UEFI image */
+efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size);
 /* Initialize variable services */
 efi_status_t efi_init_variables(void);
 /* Notify ExitBootServices() is called */