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/include/net/pfe_eth/pfe_eth.h b/include/net/pfe_eth/pfe_eth.h
index 68b2e38..116a2b2 100644
--- a/include/net/pfe_eth/pfe_eth.h
+++ b/include/net/pfe_eth/pfe_eth.h
@@ -7,6 +7,7 @@
 #ifndef __PFE_ETH_H__
 #define __PFE_ETH_H__
 
+#include <linux/bitops.h>
 #include <linux/sizes.h>
 #include <asm/io.h>
 #include <miiphy.h>