Since the DW PCIe common code (dw_pcie_version_detect()) now reads the IP
core version directly from the hardware, there is no point manually setting
the version for controllers newer than v4.70a.

Remove the now-superfluous intel-gw code that sets struct dw_pcie.version.
Suggested-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220624143947.8991-7-Sergey.Semin@baikalelectronics.ruSigned-off-by: NSerge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>