drm/xe/vf: Obtain value of GMDID register from GuC

VFs don't have access to the GMDID register and must obtain it
value using GuC VF ABI KLV query. Add function for doing that.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240523192240.844-4-michal.wajdeczko@intel.com