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/usb/host/xhci.c b/drivers/usb/host/xhci.c
index c95831c..ec57f72 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -29,6 +29,7 @@
 #include <watchdog.h>
 #include <asm/cache.h>
 #include <asm/unaligned.h>
+#include <linux/bug.h>
 #include <linux/errno.h>
 #include <usb/xhci.h>