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/drivers/net/ravb.c b/drivers/net/ravb.c
index 3dab91b..393ee9b 100644
--- a/drivers/net/ravb.c
+++ b/drivers/net/ravb.c
@@ -17,6 +17,7 @@
 #include <miiphy.h>
 #include <malloc.h>
 #include <asm/cache.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/mii.h>
 #include <wait_bit.h>