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/softing/vining_2000/vining_2000.c b/board/softing/vining_2000/vining_2000.c
index 19fb85f..e5e33dc 100644
--- a/board/softing/vining_2000/vining_2000.c
+++ b/board/softing/vining_2000/vining_2000.c
@@ -19,6 +19,7 @@
 #include <asm/io.h>
 #include <asm/mach-imx/mxc_i2c.h>
 #include <env.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/sizes.h>
 #include <common.h>