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_rk3399.h b/arch/arm/include/asm/arch-rockchip/sdram_rk3399.h
index 267649f..c76372e 100644
--- a/arch/arm/include/asm/arch-rockchip/sdram_rk3399.h
+++ b/arch/arm/include/asm/arch-rockchip/sdram_rk3399.h
@@ -7,6 +7,9 @@
 #define _ASM_ARCH_SDRAM_RK3399_H
 #include <asm/arch-rockchip/sdram_common.h>
 #include <asm/arch-rockchip/sdram_msch.h>
+#ifndef __ASSEMBLY__
+#include <linux/bitops.h>
+#endif
 
 struct rk3399_ddr_pctl_regs {
 	u32 denali_ctl[332];