efi_loader: implement EFI_RESET_SHUTDOWN at boot time

Allow an EFI application to shut down the system.

If EFI_RESET_SHUTDOWN is issued call do_poweroff().

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

lib/efi_loader/efi_runtime.c

@@ -141,7 +141,9 @@ static void EFIAPI efi_reset_system_boottime(
 		do_reset(NULL, 0, 0, NULL);
 		break;
 	case EFI_RESET_SHUTDOWN:
-		/* We don't have anything to map this to */
+#ifdef CONFIG_CMD_POWEROFF
+		do_poweroff(NULL, 0, 0, NULL);
+#endif
 		break;
 	}