efi_loader: event signaling in ExitBootServices

ExitBootServices() has to stop timer related activity before calling the
events of the EFI_EVENT_GROUP_EXIT_BOOT_SERVICES event group. But our
current implementation was stopping all other events.

All events have to observe the task priority level.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_runtime.c b/lib/efi_loader/efi_runtime.c
index 9c50955..432551d 100644
--- a/lib/efi_loader/efi_runtime.c
+++ b/lib/efi_loader/efi_runtime.c
@@ -130,7 +130,7 @@
 		if (evt->group &&
 		    !guidcmp(evt->group,
 			     &efi_guid_event_group_reset_system)) {
-			efi_signal_event(evt, false);
+			efi_signal_event(evt);
 			break;
 		}
 	}