drm/i915: DG2 and ATS-M device ID updates

Small BAR support has now landed, which allows us to add the PCI IDs
that correspond to add-in card designs of DG2 and ATS-M.  There's also
one additional MB-down PCI ID that recently appeared (0x5698) so we add
it too.

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220701152231.529511-2-matthew.d.roper@intel.com