ARM: dts: imx7d-nitrogen7: fix rv4162 compatible

The rv4162 compatbile string is missing the vendor part, add it.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx7d-nitrogen7.dts

@@ -279,7 +279,7 @@ &i2c2 {
 	status = "okay";
 
 	rtc@68 {
-		compatible = "rv4162";
+		compatible = "microcrystal,rv4162";
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_i2c2_rv4162>;
 		reg = <0x68>;