drm/xe: Remove i915_utils dependency from xe_guc_pc.

To make it simpler, all of the status checks also waits and
times out.

Also, no ktime precision is needed in this case, and we
can use usleep_range because we are not in atomic paths here.

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>