dm: core: Add flags parameter to device_remove()

This patch adds the flags parameter to device_remove() and changes all
calls to this function to provide the default value of DM_REMOVE_NORMAL
for "normal" device removal.

This is in preparation for the driver specific pre-OS (e.g. DMA
cancelling) remove support.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/eth.c b/test/dm/eth.c
index 6288ae2..564ad36 100644
--- a/test/dm/eth.c
+++ b/test/dm/eth.c
@@ -116,7 +116,7 @@
 	for (i = 0; i < DM_TEST_ETH_NUM; i++) {
 		ut_assertok(uclass_find_device_by_name(UCLASS_ETH,
 						       ethname[i], &dev[i]));
-		ut_assertok(device_remove(dev[i]));
+		ut_assertok(device_remove(dev[i], DM_REMOVE_NORMAL));
 
 		/* Invalidate MAC address */
 		strcpy(ethaddr[i], getenv(addrname[i]));