arm64: zynqmp: Add 8-bit bus width property for ep108

This patch add 8-bit bus width property to eMMC node.
Signed-off-by: NP L Sai Krishna <lakshmis@xilinx.com>
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

arch/arm64/boot/dts/xilinx/zynqmp-ep108.dts

@@ -92,6 +92,7 @@
 
 &sdhci0 {
 	status = "okay";
+	bus-width = <8>;
 };
 
 &sdhci1 {