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/pfe_hw.h b/include/net/pfe_eth/pfe/pfe_hw.h
index 5da676b..c69fc69 100644
--- a/include/net/pfe_eth/pfe/pfe_hw.h
+++ b/include/net/pfe_eth/pfe/pfe_hw.h
@@ -8,6 +8,7 @@
 #define _PFE_H_
 
 #include <elf.h>
+#include <linux/bitops.h>
 #include "cbus.h"
 
 #define PFE_RESET_WA