arm64: dts: rockchip: Add sata nodes to rk356x

RK356x supports up to 3 sata controllers which were compatible with the
existing snps,dwc-ahci binding.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Link: https://lore.kernel.org/r/20220311210357.222830-7-linux@fw-web.de


Signed-off-by: Heiko Stuebner <heiko@sntech.de>