drm/xe/sriov: Move VF bootstrap and query_config to vf_guc_init

drm/xe/sriov: Move VF bootstrap and query_config to vf_guc_init

We want to split up GUC init to an alloc and noalloc part to keep the
init path the same for VF and !VF as much as possible.

Everything in vf_guc_init should be done as early as possible, otherwise
VRAM probing becomes impossible.

Also move xe_gt_mmio_init to the end of xe_gt_init_early(), cleaning up
the init in xe_device slightly.

Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20250619104858.418440-15-dev@lankhorst.se
Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>