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/mt7628-eth.c b/drivers/net/mt7628-eth.c
index a2e022d..64f1c8c 100644
--- a/drivers/net/mt7628-eth.c
+++ b/drivers/net/mt7628-eth.c
@@ -25,6 +25,7 @@
 #include <asm/cache.h>
 #include <asm/io.h>
 #include <linux/bitfield.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/err.h>