For Xe1 platforms, it's better to follow the way i915 adds the PCI IDs
to the header, so it's easier to catch up when there is an update. This
brings the same logic applied in commit 2e3c369f ("drm/i915/mtl:
Eliminate subplatforms") to the equivalent xe header.

The end result of this header for Xe1 platforms is now in sync with i915
as of commit 5032c607 ("drm/i915: ATS-M device ID update"). This can
be seen by

	$ git show 5032c607:include/drm/i915_pciids.h > a.h
	$ git diff --color-words  --no-index a.h include/drm/xe_pciids.h
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20231121195209.802235-2-lucas.demarchi@intel.comSigned-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>