ARM: dts: imx6qdl-nitrogen6_som2: fix rv4162 compatible

The rv4162 vendor is microcrystal, not ST.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: NGary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-nitrogen6_som2.dtsi

@@ -326,7 +326,7 @@
 	};
 
 	rtc@68 {
-		compatible = "st,rv4162";
+		compatible = "microcrystal,rv4162";
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_rv4162>;
 		reg = <0x68>;