drm/xe/xe3p_lpg: Disable reporting of context switch status to GHWSP

drm/xe/xe3p_lpg: Disable reporting of context switch status to GHWSP

By default the hardware reports context switch status into the global
hardware status page.  The Xe driver doesn't use this information for
anything, and as of Xe3p, leaving this setting enabled will prevent
other hardware optimizations from being enabled.  Disable this reporting
as suggested by the tuning guide.

Bspec: 72161
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
Link: https://patch.msgid.link/20260206-nvl-p-upstreaming-v3-7-636e1ad32688@intel.com
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>