Introduces performance tuning guide changes for Xe_HPG.

v2: Switched to open upper bound for "Tuning: L3 Cache" setting.

BSpec: 72161
Signed-off-by: Shekhar Chauhan <shekhar.chauhan@intel.com>
Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@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/20240408170545.3769566-11-balasubramani.vivekanandan@intel.com