ARM: dts: imxrt1050: increase mmc max-frequency property

According to i.MXRT1050 Datasheet usdhc supports up to 200Mhz clock so
let's increase max-frequency property to 200Mhz.
Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Acked-by: Jesse Taube <mr.bossman075@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imxrt1050.dtsi

@@ -93,7 +93,7 @@ usdhc1: mmc@402c0000 {
 			bus-width = <4>;
 			fsl,wp-controller;
 			no-1-8-v;
-			max-frequency = <4000000>;
+			max-frequency = <200000000>;
 			fsl,tuning-start-tap = <20>;
 			fsl,tuning-step = <2>;
 			status = "disabled";