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/watchdog/designware_wdt.c b/drivers/watchdog/designware_wdt.c
index 1024a04..12f09a7 100644
--- a/drivers/watchdog/designware_wdt.c
+++ b/drivers/watchdog/designware_wdt.c
@@ -10,6 +10,7 @@
 #include <wdt.h>
 #include <asm/io.h>
 #include <asm/utils.h>
+#include <linux/bitops.h>
 
 #define DW_WDT_CR	0x00
 #define DW_WDT_TORR	0x04