ARM: dts: imx7-mba7: Add RTC aliases

Ensure the RTC devices are numbered correctly.
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/nxp/imx/imx7-mba7.dtsi

@@ -18,6 +18,8 @@ aliases {
 		mmc0 = &usdhc3;
 		mmc1 = &usdhc1;
 		/delete-property/ mmc2;
+		rtc0 = &ds1339;
+		rtc1 = &snvs_rtc;
 	};
 
 	beeper {