arm64: dts: rockchip: add board-aliases for Qnap-TS433

Add the aliases for the internal network interface as well as the emmc
on the board and make sure the dedicated RTC is always the first one.

The TS433 actually has two rtc devices. One coming from the rk809 pmic
without added functionality and also a dedicated RTC from Mycrocrystal
that is battery backed to keep the time.

Tested-by: Uwe Kleine-König <ukleinek@debian.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20240723195538.1133436-8-heiko@sntech.de