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/dc2114x.c b/drivers/net/dc2114x.c
index 611a8c4..c55358e 100644
--- a/drivers/net/dc2114x.c
+++ b/drivers/net/dc2114x.c
@@ -6,6 +6,7 @@
 #include <net.h>
 #include <netdev.h>
 #include <pci.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 
 #define SROM_DLEVEL	0