drm/xe: Split init of xe_gt_init_hwconfig to xe_gt_init and *_early

Now that we added the separate step of initialising GUC in
xe_gt_init_early, it should be ok to initialise the minimum during early
init, and the rest after allocations are allowed.

Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20250619104858.418440-20-dev@lankhorst.se


Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>