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/usb/emul/sandbox_hub.c b/drivers/usb/emul/sandbox_hub.c
index c3a8e73..f0939b1 100644
--- a/drivers/usb/emul/sandbox_hub.c
+++ b/drivers/usb/emul/sandbox_hub.c
@@ -156,7 +156,7 @@
 			} else if (clear & USB_PORT_STAT_POWER) {
 				debug("%s: %s: power off, removed, ret=%d\n",
 				      __func__, dev->name, ret);
-				ret = device_remove(dev);
+				ret = device_remove(dev, DM_REMOVE_NORMAL);
 				clear |= USB_PORT_STAT_CONNECTION;
 			}
 		}