PCI: rockchip: Drive at 2.5 GT/s, error other speeds

Configure the core to be driven at 2.5 GT/s Link Speed and ignore any other
speed with a warning. Also drop the 5.0 GT/s Link Speed defines from
Rockchip PCIe header.

The reason is that Shawn Lin from Rockchip has reiterated that there may be
danger of "catastrophic failure" in using their PCIe with 5.0 GT/s speeds.

While Rockchip has done so informally without issuing a proper errata, and
the particulars are thus unknown, this may cause data loss or worse.

This change is corroborated by RK3399 official datasheet [1], which states
maximum link speed for this platform is 2.5 GT/s.

[1] https://opensource.rock-chips.com/images/d/d7/Rockchip_RK3399_Datasheet_V2.1-20200323.pdf

Fixes: 956cd99b35a8 ("PCI: rockchip: Separate common code from RC driver")
Reported-by: Dragan Simic <dsimic@manjaro.org>
Reported-by: Shawn Lin <shawn.lin@rock-chips.com>
Link: https://lore.kernel.org/all/ffd05070-9879-4468-94e3-b88968b4c21b@rock-chips.com/
Signed-off-by: Geraldo Nascimento <geraldogabriel@gmail.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/7421df7a7b7778ee99363cccfdfabbfa8aa6ab5e.1781622998.git.geraldogabriel@gmail.com

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