drm/i915/xe3lpd: reuse xe2lpd definition

xe3_lpd display is functionally identical to xe2_lpd for now so reuse
the device description.  A separate xe3 definition will be added in the
future if/when new feature flags are required.

Signed-off-by: Clint Taylor <clinton.a.taylor@intel.com>
Signed-off-by: Matt Atwood <matthew.s.atwood@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241010224311.50133-2-matthew.s.atwood@intel.com