ARM: dts: imx6q-dhcom: fix rtc compatible

The only correct and documented compatible string for the rv3029 is
microcrystal,rv3029. Fix it up.

Fixes: 52c7a088 ("ARM: dts: imx6q: Add support for the DHCOM iMX6 SoM and PDK2")
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6q-dhcom-som.dtsi

@@ -204,7 +204,7 @@ eeprom@50 {
 	};
 
 	rtc@56 {
-		compatible = "rv3029c2";
+		compatible = "microcrystal,rv3029";
 		pinctrl-names = "default";
 		pinctrl-0 = <&pinctrl_rtc_hw300>;
 		reg = <0x56>;