drm/i915/dg2: Drop force_probe requirement

DG2 has been very usable for a while now, and all of the uapi changes
related to fundamental platform usage have been finalized.  Recent CI
results have also been healthy, so we're ready to drop the force_probe
requirement and enable the platform by default.

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221109001328.732000-1-matthew.d.roper@intel.com