drm/xe/kunit: Introduce xe_pci_fake_data_desc()

We already use struct xe_pci_fake_data to provide custom config of
the fake PCI device and soon we will be using this struct also as
direct parameter for the parameterized Xe KUnit tests.

Add function to generate description based on that config data.

For platform or subplatform name lookup pciidlist which already
have definitions of all supported platforms.

Examples:

  TIGERLAKE
  TIGERLAKE A0
  TIGERLAKE SR-IOV PF
  ...
  PANTHERLAKE 30.00(Xe3_LPG) 30.00(Xe3_LPM)
  PANTHERLAKE 30.00(Xe3_LPG) A0 30.00(Xe3_LPM) A0
  PANTHERLAKE 30.00(Xe3_LPG) A0 30.00(Xe3_LPM) A0 SR-IOV VF

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20250829171922.572-4-michal.wajdeczko@intel.com