drm/i915/display/xelpd: Extend Wa_14011508470

This workaround is also applicable to xelpd display so extending it.

Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210713003854.143197-6-jose.souza@intel.com