drm/xe/vf: Disable features that do not apply to VFs

We already maintain several flags that control the availability
of features on a given device. Disable features, like PCODE or
GuC PC or GSC, that do not apply to a VF device.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Piotr Piórkowski <piotr.piorkowski@intel.com>
Reviewed-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240620100147.949-1-michal.wajdeczko@intel.com