We plan to introduce per-lane PHYs, so factor out rockchip_pcie_get_phys()
to make it easier in the future.  No functional change intended.
Tested-by: NJeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: NShawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NBrian Norris <briannorris@chromium.org>
Acked-by: NKishon Vijay Abraham I <kishon@ti.com>