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/arch-rockchip/sdram_rk322x.h b/arch/arm/include/asm/arch-rockchip/sdram_rk322x.h
index 99942e6..6f6c5c9 100644
--- a/arch/arm/include/asm/arch-rockchip/sdram_rk322x.h
+++ b/arch/arm/include/asm/arch-rockchip/sdram_rk322x.h
@@ -5,6 +5,10 @@
 #ifndef _ASM_ARCH_SDRAM_RK322X_H
 #define _ASM_ARCH_SDRAM_RK322X_H
 
+#ifndef __ASSEMBLY__
+#include <linux/bitops.h>
+#endif
+
 struct rk322x_sdram_channel {
 	/*
 	 * bit width in address, eg: