arm64: dts: imx8mn: Add "fsl,imx8mq-src" as src's fallback compatible

i.MX8MN can reuse i.MX8MQ's src driver, add "fsl,imx8mq-src" as
src's fallback compatible to enable it.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

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

@@ -371,7 +371,7 @@ clk: clock-controller@30380000 {
 			};
 
 			src: reset-controller@30390000 {
-				compatible = "fsl,imx8mn-src", "syscon";
+				compatible = "fsl,imx8mn-src", "fsl,imx8mq-src", "syscon";
 				reg = <0x30390000 0x10000>;
 				interrupts = <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>;
 				#reset-cells = <1>;