arm64: dts: rockchip: Add PCIe v3 nodes to BPI-R2-Pro

Add Nodes to Bananapi-R2-Pro board to support PCIe v3 and
set PCIe related regulators to always on.

Suggested-by: Peter Geis <pgwipeout@gmail.com>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Link: https://lore.kernel.org/r/20220825193836.54262-6-linux@fw-web.de


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