powerpc/5200: dts: digsy_mtc.dts: fix rv3029 compatible

The proper compatible for rv3029 is microcrystal,rv3029.
Acked-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/boot/dts/digsy_mtc.dts

@@ -78,7 +78,7 @@ eeprom@50 {
 			};
 
 			rtc@56 {
-				compatible = "mc,rv3029c2";
+				compatible = "microcrystal,rv3029";
 				reg = <0x56>;
 			};