arm64: dts: rockchip: Add PCIe for RockPI N10

This patch adds support to enable PCIe for RockPI N10.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Link: https://lore.kernel.org/r/20200720110230.367985-3-jagan@amarulasolutions.com


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