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/ti/ks2_evm/board_k2g.c b/board/ti/ks2_evm/board_k2g.c
index 450ccc4..ece7532 100644
--- a/board/ti/ks2_evm/board_k2g.c
+++ b/board/ti/ks2_evm/board_k2g.c
@@ -18,6 +18,7 @@
 #include <fdtdec.h>
 #include <i2c.h>
 #include <remoteproc.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 #include "mux-k2g.h"
 #include "../common/board_detect.h"