ARM: dts: imx7d-smegw01: Remove unneeded #address-cells/#size-cells

Remove the unneeded #address-cells/#size-cells from sram@0 to fix
the following 'make CHECK_DTBS=y imx7d-smegw01.dtb' warning:

sram@0: Unevaluated properties are not allowed ('#address-cells', '#size-cells' were unexpected)
From schema: Documentation/devicetree/bindings/mtd/microchip,mchp48l640.yaml
Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7d-smegw01.dts

@@ -97,8 +97,6 @@ &ecspi1 {
 	sram@0 {
 		compatible = "microchip,48l640";
 		reg = <0>;
-		#address-cells = <1>;
-		#size-cells = <1>;
 		spi-max-frequency = <16000000>;
 	};
 };