rockchip: rk3288: fix EMMC_DIV_MASK definition in header

It should be '<<' instead of '<' for _MASK definition, fix it.

Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/include/asm/arch-rockchip/cru_rk3288.h

@@ -85,7 +85,7 @@ enum {
 	EMMC_PLL_SELECT_24MHZ,
 
 	EMMC_DIV_SHIFT		= 8,
-	EMMC_DIV_MASK		= 0x3f < EMMC_DIV_SHIFT,
+	EMMC_DIV_MASK		= 0x3f << EMMC_DIV_SHIFT,
 
 	SDIO0_PLL_SHIFT		= 6,
 	SDIO0_PLL_MASK		= 3 << SDIO0_PLL_SHIFT,