drm/xe/xelp: L3 recommended hashing mask

drm/xe/xelp: L3 recommended hashing mask

According to the i915 codebase xe missed to set the recommended
performance tuning for L3 hashing which is applicable to all legacy XeLP
platforms. Lets add it.

v2:
 * Rename prefixes to XELP_.
 * Tweak version end point.

v3:
 * Add bspec tag.
 * Tweak version range.

v4:
 * Move from LRC to engine tunings list.

v5:
 * Drop L3 Cache Control comment.

Bspec: 31870
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
References: c46c5fb725be ("drm/i915/gen12: Apply recommended L3 hashing mask")
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250227101304.46660-5-tvrtko.ursulin@igalia.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>