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/arch/arm/include/asm/ti-common/omap_wdt.h b/arch/arm/include/asm/ti-common/omap_wdt.h
index fbc421b..42d7e4c 100644
--- a/arch/arm/include/asm/ti-common/omap_wdt.h
+++ b/arch/arm/include/asm/ti-common/omap_wdt.h
@@ -10,6 +10,10 @@
 #ifndef __OMAP_WDT_H__
 #define __OMAP_WDT_H__
 
+#ifndef __ASSEMBLY__
+#include <linux/bitops.h>
+#endif
+
 /*
  * Watchdog:
  * Using the prescaler, the OMAP watchdog could go for many