arm64: dts: ti: k3-am62a7-sk: Add alias for RTC

commit f745d9063212d1088dcfb068ecb4b16648b96487 from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git



Adds alias for SoC RTC so that it gets assigned rtc0. PMIC node is
assisgned rtc1 so that PMIC RTC gets probed as rtc1. This makes it
consistent for testing with other AM62 devices where rtc0 is SoC
RTC.

Signed-off-by: Vibhore Vardhan <vibhore@ti.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>