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/mach-keystone/include/mach/hardware.h b/arch/arm/mach-keystone/include/mach/hardware.h
index d2234dc..0c5dc6a 100644
--- a/arch/arm/mach-keystone/include/mach/hardware.h
+++ b/arch/arm/mach-keystone/include/mach/hardware.h
@@ -11,6 +11,7 @@
 #include <config.h>
 
 #ifndef __ASSEMBLY__
+#include <linux/bitops.h>
 
 #include <linux/sizes.h>
 #include <asm/io.h>