Force synchronous ISYS suspend on close

[Copilot]

The ISYS video close path currently drops the runtime PM reference through the autosuspend path, which can leave the IS island short of a full power-cycle after an unclean STREAM_FLUSH / STREAM_CLOSE. This updates close handling to synchronously suspend on every final close so S2B/B2O return to POR state.

• Close-path PM runtime behavior

  • Replace the final-close pm_runtime_put() in ipu7_isys_fw_close() with pm_runtime_put_sync_suspend().
  • This makes the close path force the suspend transition immediately instead of deferring through autosuspend.

• Preserved rationale at callsite

  • Keep the close-path comment describing why every close should force an immediate IS island power-cycle, even when firmware close/flush completion is not clean.

• Change scope

  • Limited to the single ISYS video close-path behavior change in drivers/media/pci/intel/ipu7/ipu7-isys-video.c.

/*
 * Force an immediate synchronous power-cycle of the IS island on
 * every close, ignoring autosuspend, so S2B/B2O return to POR state
 * even if STREAM_FLUSH/STREAM_CLOSE did not complete cleanly.
 */
pm_runtime_put_sync_suspend(&isys->adev->auxdev.dev);