arm64: dts: rockchip: add three new resets for rk3399 PCIe controller

pm_rst, aclk_rst and pclk_rst should be controlled by driver, so we
need to add these three resets for PCIe controller.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>