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/mscc/common/spi.c b/board/mscc/common/spi.c
index 0566fcb..45b9649 100644
--- a/board/mscc/common/spi.c
+++ b/board/mscc/common/spi.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <asm/io.h>
 #include <spi.h>
+#include <linux/bitops.h>
 
 void external_cs_manage(struct udevice *dev, bool enable)
 {