drm/xe/xe3p_lpg: Extend 'group ID' mask size

drm/xe/xe3p_lpg: Extend 'group ID' mask size

Xe3p_LPG extends the 'group ID' register mask by one bit.  Since the new
upper bit (12) was unused on previous platforms, we can safely extend
the existing mask size without worrying about adding conditional version
checks to the register programming.

Bspec: 67175
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Dnyaneshwar Bhadane <dnyaneshwar.bhadane@intel.com>
Link: https://patch.msgid.link/20260206-nvl-p-upstreaming-v3-9-636e1ad32688@intel.com
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>