arm64: dts: imx8mn: Fix duplicate node name

Error log:
sysfs: cannot create duplicate filename '/bus/platform/devices/30000000.bus'

The spba bus name is duplicate with aips bus name.
Refine spba bus name to fix this issue.

Fixes: 970406ea ("arm64: dts: imx8mn: Enable Asynchronous Sample Rate Converter")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mn.dtsi

@@ -253,7 +253,7 @@ aips1: bus@30000000 {
 			#size-cells = <1>;
 			ranges;
 
-			spba: bus@30000000 {
+			spba: spba-bus@30000000 {
 				compatible = "fsl,spba-bus", "simple-bus";
 				#address-cells = <1>;
 				#size-cells = <1>;