common: Drop linux/bug.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 7130b84..7f1cbc5 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -13,6 +13,7 @@
 #include <virtio_types.h>
 #include <virtio.h>
 #include <virtio_ring.h>
+#include <linux/bug.h>
 #include <linux/compat.h>
 
 int virtqueue_add(struct virtqueue *vq, struct virtio_sg *sgs[],