arm64: dts: imx8mq-librem5: Enable SNVS RTC

It has been disabled because it was being used for system clock instead
of the discrete RTC. However, SNVS has some features that the discrete
RTC does not, such as being able to turn the device on. Solve that issue
with aliases instead and reenable SNVS RTC.

Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: dos1

arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi

@@ -17,6 +17,11 @@
 	compatible = "purism,librem5", "fsl,imx8mq";
 	chassis-type = "handset";
 
+	aliases {
+		rtc0 = &rtc;
+		rtc1 = &snvs_rtc;
+	};
+
 	backlight_dsi: backlight-dsi {
 		compatible = "led-backlight";
 		leds = <&led_backlight>;
@@ -1001,7 +1006,7 @@
 		};
 	};
 
-	rtc@68 {
+	rtc: rtc@68 {
 		compatible = "microcrystal,rv4162";
 		reg = <0x68>;
 		pinctrl-names = "default";
@@ -1316,10 +1321,6 @@
 	status = "okay";
 };
 
-&snvs_rtc {
-	status = "disabled";
-};
-
 &uart1 { /* console */
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart1>;