arm64: dts: imx8qm: Add SCU RTC node

Add SCU RTC node to support SC RTC driver.
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8qm.dtsi

@@ -201,6 +201,9 @@ iomuxc: pinctrl {
 			compatible = "fsl,imx8qm-iomuxc";
 		};
 
+		rtc: rtc {
+			compatible = "fsl,imx8qxp-sc-rtc";
+		};
 	};
 
 	/* sorted in register address */