efi_loader: use efi_start_image() for bootefi

Remove the duplicate code in efi_do_enter() and use efi_start_image() to
start the image invoked by the bootefi command.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 155cdc5..45ed367 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -1772,9 +1772,9 @@
  *
  * Return: status code
  */
-static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
-					   efi_uintn_t *exit_data_size,
-					   u16 **exit_data)
+efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
+				    efi_uintn_t *exit_data_size,
+				    u16 **exit_data)
 {
 	struct efi_loaded_image_obj *image_obj =
 		(struct efi_loaded_image_obj *)image_handle;