arm64: dts: imx8mm-kontron: Add RTC aliases

Add aliases for the RTCs on the board and on the SoC. This ensures that
the primary RTC is always the one on the board that has a buffered supply
and maximum accuracy.
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mm-kontron-bl.dts

@@ -13,6 +13,8 @@ / {
 
 	aliases {
 		ethernet1 = &usbnet;
+		rtc0 = &rx8900;
+		rtc1 = &snvs_rtc;
 	};
 
 	/* fixed crystal dedicated to mcp2515 */
@@ -136,7 +138,7 @@ &i2c4 {
 	pinctrl-0 = <&pinctrl_i2c4>;
 	status = "okay";
 
-	rtc@32 {
+	rx8900: rtc@32 {
 		compatible = "epson,rx8900";
 		reg = <0x32>;
 	};

arch/arm64/boot/dts/freescale/imx8mm-kontron-osm-s.dtsi

@@ -10,6 +10,11 @@ / {
 	model = "Kontron OSM-S i.MX8MM (N802X SOM)";
 	compatible = "kontron,imx8mm-osm-s", "fsl,imx8mm";
 
+	aliases {
+		rtc0 = &rv3028;
+		rtc1 = &snvs_rtc;
+	};
+
 	memory@40000000 {
 		device_type = "memory";
 		/*
@@ -200,7 +205,7 @@ reg_nvcc_sd: LDO5 {
 		};
 	};
 
-	rtc@52 {
+	rv3028: rtc@52 {
 		compatible = "microcrystal,rv3028";
 		reg = <0x52>;
 		pinctrl-names = "default";