mmc: increse the max-frequency for read/write speed of emmc

Change-Id: Ibd7102635b2c6424c11e9e0d9bf6c1ba713cc477
Reviewed-on: https://tp-biosrd-v02/gerrit/80610
Reviewed-by: Alex Cheng(鄭富元) <Alex_Cheng@asus.com>
Tested-by: Alex Cheng(鄭富元) <Alex_Cheng@asus.com>

Author: alex3788

arch/arm/boot/dts/rk3288-miniarm.dts

@@ -913,7 +913,7 @@
 	num-slots = <1>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&emmc_clk &emmc_cmd &emmc_pwr &emmc_bus8>;
-	max-frequency = <100000000>;
+	max-frequency = <150000000>;
 	mmc-hs200-1_8v;
 	mmc-ddr-1_8v;
 	status = "okay";