gpio2_8 is connected to the PCIe_RESETn line and it has to be driven low to
reset the PCIe cards.  Add gpios property to PCIe DT node.
Signed-off-by: NKishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NTony Lindgren <tony@atomide.com>