ARM: dts: rockchip: set dw_mmc max-freq 150Mhz

All of mmc controllers include SDMMC, SDIO0, SDIO1, and EMMC on RK3288
are limited to 150Mhz. It was mainly caused by two reasons:
- RK3288's IO pad(except DDR IO pad) is generic, which can only support
  the max of 150Mhz.
- Mmc controller was designed at 150Mhz, and the pressure test by IC team
  was based on this freequency point.

Signed-off-by: Addy Ke <addy.ke@rock-chips.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Tested-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3288.dtsi

@@ -151,6 +151,7 @@
 
 	sdmmc: dwmmc@ff0c0000 {
 		compatible = "rockchip,rk3288-dw-mshc";
+		clock-freq-min-max = <400000 150000000>;
 		clocks = <&cru HCLK_SDMMC>, <&cru SCLK_SDMMC>;
 		clock-names = "biu", "ciu";
 		fifo-depth = <0x100>;
@@ -161,6 +162,7 @@
 
 	sdio0: dwmmc@ff0d0000 {
 		compatible = "rockchip,rk3288-dw-mshc";
+		clock-freq-min-max = <400000 150000000>;
 		clocks = <&cru HCLK_SDIO0>, <&cru SCLK_SDIO0>;
 		clock-names = "biu", "ciu";
 		fifo-depth = <0x100>;
@@ -171,6 +173,7 @@
 
 	sdio1: dwmmc@ff0e0000 {
 		compatible = "rockchip,rk3288-dw-mshc";
+		clock-freq-min-max = <400000 150000000>;
 		clocks = <&cru HCLK_SDIO1>, <&cru SCLK_SDIO1>;
 		clock-names = "biu", "ciu";
 		fifo-depth = <0x100>;
@@ -181,6 +184,7 @@
 
 	emmc: dwmmc@ff0f0000 {
 		compatible = "rockchip,rk3288-dw-mshc";
+		clock-freq-min-max = <400000 150000000>;
 		clocks = <&cru HCLK_EMMC>, <&cru SCLK_EMMC>;
 		clock-names = "biu", "ciu";
 		fifo-depth = <0x100>;