arm64: dts: rockchip: move rk3588 serial aliases to soc dtsi

arm64: dts: rockchip: move rk3588 serial aliases to soc dtsi

The serial ports on rk3588 are named uart0 - uart9. Board schematics
also use these exact numbers and we want those names to also reflect
in the OS devices because everything else would just cause confusion.

To prevent each board repeating their list of serial aliases, move them
to the soc dtsi, as all previous Rockchip soc do already.

Signed-off-by: Heiko Stuebner <heiko.stuebner@cherry.de>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
Link: https://lore.kernel.org/r/20231205164842.556684-2-heiko@sntech.de