arm: Remove vital devices last

Update announce_and_cleanup() to remove all devices, with the vital ones
being removed last.

This is an extra patch on top of the recent RFC:

   http://patchwork.ozlabs.org/project/uboot/list/?series=223280

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/arm/lib/bootm.c

@@ -119,6 +119,9 @@ static void announce_and_cleanup(int fake)
 	 * This may be useful for last-stage operations, like cancelling
 	 * of DMA operation or releasing device internal buffers.
 	 */
+	dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL | DM_REMOVE_NON_VITAL);
+
+	/* Remove all active vital devices next */
 	dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
 
 	cleanup_before_linux();