drm/xe: Remove xe_uc_init_hwconfig()

This function is called immediately after xe_uc_init(), so just put it
there instead.

Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20250619104858.418440-22-dev@lankhorst.se


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