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/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 9966cad..d1f6029 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -21,6 +21,7 @@
 
 #include <common.h>
 #include <malloc.h>
+#include <linux/bug.h>
 #include <linux/errno.h>
 #include <linux/compat.h>
 #include <ubi_uboot.h>