drm/xe/vf: Start post-migration fixups with provisioning query

drm/xe/vf: Start post-migration fixups with provisioning query

During post-migration recovery, only MMIO communication to GuC is
allowed. The VF KMD needs to use that channel to ask for the new
provisioning, which includes a new GGTT range assigned to the VF.

v2: query config only instead of handshake; no need to get pm ref as
 it's now kept through whole recovery (Michal)
v3: switched names of 'err' and 'ret'  (Michal)

Signed-off-by: Tomasz Lis <tomasz.lis@intel.com>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241104213449.1455694-5-tomasz.lis@intel.com
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>