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/drivers/mtd/spi/sandbox.c b/drivers/mtd/spi/sandbox.c
index 36a50fe..a53f4eb 100644
--- a/drivers/mtd/spi/sandbox.c
+++ b/drivers/mtd/spi/sandbox.c
@@ -595,7 +595,7 @@
 	struct udevice *dev;
 
 	dev = state->spi[busnum][cs].emul;
-	device_remove(dev);
+	device_remove(dev, DM_REMOVE_NORMAL);
 	device_unbind(dev);
 	state->spi[busnum][cs].emul = NULL;
 }