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/mvpp2.c b/drivers/net/mvpp2.c
index ebe67e4..19b9375 100644
--- a/drivers/net/mvpp2.c
+++ b/drivers/net/mvpp2.c
@@ -26,6 +26,7 @@
 #include <config.h>
 #include <malloc.h>
 #include <asm/io.h>
+#include <linux/bitops.h>
 #include <linux/bug.h>
 #include <linux/delay.h>
 #include <linux/err.h>