drm/xe: Use fixed CCS mode when running in SR-IOV mode

We don't support changing CCS mode when running in SR-IOV mode yet.
When running as a PF driver just apply default ccs_mode=1 that VF
drivers will assume as already applied and fixed.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240614101415.2208-1-michal.wajdeczko@intel.com