common: Drop linux/bitops.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/div64.c b/lib/div64.c
index 62933c9..779d752 100644
--- a/lib/div64.c
+++ b/lib/div64.c
@@ -17,6 +17,7 @@
  * or by defining a preprocessor macro in arch/include/asm/div64.h.
  */
 
+#include <linux/bitops.h>
 #include <linux/compat.h>
 #include <linux/kernel.h>
 #include <linux/math64.h>