ARM: dts: mxs: Fix the RTC compatible prop on M28EVK

The compatible property should be m41t62, not mt41t62, so fix this.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NShawn Guo <shawn.guo@linaro.org>

arch/arm/boot/dts/imx28-m28evk.dts

@@ -194,7 +194,7 @@
 				};
 
 				rtc: rtc@68 {
-					compatible = "stm,mt41t62";
+					compatible = "stm,m41t62";
 					reg = <0x68>;
 				};
 			};