gfxinfo/intel: fix pciids.h url (following upstream change) and document new panther lake gpus
See f719c2a2d1e7fb891d45998f241ff4273d7ae7e6 "drm/intel/pciids: rename i915_pciids.h to just pciids.h"
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See f719c2a2d1e7fb891d45998f241ff4273d7ae7e6 "drm/intel/pciids: rename i915_pciids.h to just pciids.h"