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/usb/eth/r8152_fw.c b/drivers/usb/eth/r8152_fw.c
index d564de2..3ebbd53 100644
--- a/drivers/usb/eth/r8152_fw.c
+++ b/drivers/usb/eth/r8152_fw.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <dm.h>
 #include <errno.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 #include "usb_ether.h"
 #include "r8152.h"