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/board/renesas/draak/draak.c b/board/renesas/draak/draak.c
index 5f37a19..c8f4b21 100644
--- a/board/renesas/draak/draak.c
+++ b/board/renesas/draak/draak.c
@@ -17,6 +17,7 @@
 #include <asm/processor.h>
 #include <asm/mach-types.h>
 #include <asm/io.h>
+#include <linux/bitops.h>
 #include <linux/errno.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/gpio.h>