arm64: dts: lx2160a-cex7: add rtc alias

Add alias for rtc0 ensuring that on-COM RTC is assigned first index.

Note that fsl-lx2160a.dtsi already defines an alias for rtc1 which
implicitly achieved the same result.

Signed-off-by: Josua Mayer <josua@solid-run.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>

Author: Josua-SR

arch/arm64/boot/dts/freescale/fsl-lx2160a-cex7.dtsi

@@ -14,6 +14,7 @@
 
 	aliases {
 		crypto = &crypto;
+		rtc0 = &com_rtc;
 	};
 
 	sb_3v3: regulator-sb3v3 {
@@ -154,7 +155,7 @@
 &i2c4 {
 	status = "okay";
 
-	rtc@51 {
+	com_rtc: rtc@51 {
 		compatible = "nxp,pcf2129";
 		reg = <0x51>;
 		interrupts-extended = <&gpio2 8 IRQ_TYPE_LEVEL_LOW>;