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-sunxi/clock_sun6i.c b/arch/arm/mach-sunxi/clock_sun6i.c
index b46083e..8e84062 100644
--- a/arch/arm/mach-sunxi/clock_sun6i.c
+++ b/arch/arm/mach-sunxi/clock_sun6i.c
@@ -14,6 +14,7 @@
 #include <asm/arch/clock.h>
 #include <asm/arch/prcm.h>
 #include <asm/arch/sys_proto.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 
 #ifdef CONFIG_SPL_BUILD