test/intel/xe_exec_reset: Synchronize cm-gt-reset gt resetsHEADmaster

The cm-gt-reset test has the potential to race with itself on the gt
reset, so force the gt reset to be synchronous here.  The race condition
occurs because the test does not have a fencing mechanism (I.E.
dma-fence) to protect against this race, unlike in the gt-reset test
case, for example.

Suggested-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
CC: John Harrison <john.c.harrison@intel.com>
CC: Stuart Summers <stuart.summers@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://lore.kernel.org/r/20240605175843.2789838-3-jonathan.cavitt@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

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