pcie_num_lanes from the INFO ioctl does not reflect the PCIe lanes on the GPU side

pcie_mlw_mask indicates platform the PCIe lanes only and does not reflect the PCIe lanes on the GPU side.
This differs from document comments.

agd5f/linux@e3e84b0a

@mareko @agd5f

• Hardware
  • CPU: Ryzen 5 5600G (Max: PCIe Gen3x16)
  • GPU: Radeon RX 6600 (Max: PCIe Gen4x8, Available: PCIe Gen3x8)

drm_amdgpu_info_device {
    ...
    pcie_gen: 3,
    ...
    pcie_num_lanes: 16,
    ...
}
Marketing Name: [AMD Radeon RX 6600]
DeviceID.RevID: 0x73FF.0xC7