arm64: dts: meson: add i2c3/rtc nodes and vrtc alias to GT-King/GT-King-Pro

The GT-King and GT-King-Pro boxes have an RTC chip and power cell, so enable it.

GTKING:~ # dmesg | grep rtc
[    5.237245] meson-vrtc ff8000a8.rtc: registered as rtc1
[    5.261869] rtc-hym8563 0-0051: registered as rtc0
[    5.265016] rtc-hym8563 0-0051: setting system clock to 2020-11-30T09:16:54 UTC (1606727814)

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20201201062135.18241-1-christianshewitt@gmail.com