arm64: dts: rockchip: Add rk3576 pcie nodes

rk3576 has two pcie controllers, both are pcie2x1 work with
naneng-combphy.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Link: https://lore.kernel.org/r/20250221104357.1514128-3-kever.yang@rock-chips.com


Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>