drm/i915/xe3p_lpd: Reload DMC MMIO for pipes C and D

drm/i915/xe3p_lpd: Reload DMC MMIO for pipes C and D

Xe3p_LPD has the same behavior as for Xe3_LPD with respect to DMC
context data for pipes C and D, which are lost when their power wells
are disabled.  As such, let's extend the condition for Xe3_LPD in
need_pipedmc_load_mmio() to also catch Xe3p_LPD.

Bspec: 68851
Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
Link: https://patch.msgid.link/20251103-xe3p_lpd-basic-enabling-v3-13-00e87b510ae7@intel.com
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>