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AOSCOS: PCI: Override PCIe bridge supported speeds for older Loongson…

… 3C6000

series steppings

Older steppings of the Loongson 3C6000 series incorrectly report the
supported link speeds on their PCIe bridges (device IDs 3c19, 3c29) as
only 2.5 GT/s, despite the upstream bus supporting speeds from 2.5 GT/s
up to 16 GT/s.

As a result, certain PCIe devices would be incorrectly probed as a Gen1-
only, even if higher link speeds are supported, harming performance and
prevents dynamic link speed functionality from being enabled in drivers
such as amdgpu.

Manually override the `supported_speeds` field for affected PCIe bridges
with those found on the upstream bus to correctly reflect the supported
link speeds.

Tested-by: Lain "Fearyncess" Yang <[email protected]>
Reviewed-by: Mingcong Bai <[email protected]>
Signed-off-by: Ayden Meng <[email protected]>

Signed-off-by: Mingcong Bai <[email protected]>