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/mscc_eswitch/serval_switch.c b/drivers/net/mscc_eswitch/serval_switch.c
index cf8bf9c..d8ee1a7 100644
--- a/drivers/net/mscc_eswitch/serval_switch.c
+++ b/drivers/net/mscc_eswitch/serval_switch.c
@@ -11,6 +11,7 @@
 #include <dm/of_access.h>
 #include <dm/of_addr.h>
 #include <fdt_support.h>
+#include <linux/bitops.h>
 #include <linux/io.h>
 #include <linux/ioport.h>
 #include <miiphy.h>