drm/xe/guc: ban exec queue on suspend timeout

Harden guc_exec_queue_suspend_wait():

 - In multi-queue mode the primary owns the group's GuC scheduling
   context, so wait on the primary's suspend to complete.

 - On timeout, ban the queue and trigger cleanup rather than leaving it
   suspended forever. Clearing suspend_pending via __suspend_fence_signal()
   lets a subsequent resume() proceed without tripping the
   !suspend_pending assert. A timeout on the primary wedges the whole
   group, so ban and tear down the entire group in the multi-queue case.
   The ban/cleanup is factored into guc_exec_queue_suspend_timeout_ban().

Add a note that on a signal (-ERESTARTSYS) the queue is not banned and
the suspend is not confirmed complete, so callers must not resume()
without re-confirming.

Assisted-by: Github-Copilot:Claude-opus-4.8
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20260713202317.2187787-10-niranjana.vishwanathapura@intel.com

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