Revert "drm/xe: Skip exec queue schedule toggle if queue is idle during suspend"

Revert "drm/xe: Skip exec queue schedule toggle if queue is idle during suspend"

This reverts commit 8533051ce92015e9cc6f75e0d52119b9d91610b6.

The idle-skip optimization bypasses GuC suspend, so the GPU may not
perform the context switch that flushes TLB entries for invalidated
userptr VMAs. In LR/preempt-fence VM mode, this can lead to missed TLB
invalidation and page faults during userptr invalidation tests.

Restore unconditional schedule toggling on suspend so the context-switch
TLB flush is always performed.

This optimization will be reintroduced with a fix that does not skip
suspend in LR/preempt-fence VM mode.

Fixes: 8533051ce920 ("drm/xe: Skip exec queue schedule toggle if queue is idle during suspend")
Cc: stable@vger.kernel.org # v7.0+
Suggested-by: Thomas Hellstrom <thomas.hellstrom@linux.intel.com>
Signed-off-by: Tangudu Tilak Tirumalesh <tilak.tirumalesh.tangudu@intel.com>
Reviewed-by: Thomas Hellstrom <thomas.hellstrom@linux.intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patch.msgid.link/20260603065217.3131066-2-tilak.tirumalesh.tangudu@intel.com
(cherry picked from commit 6a1e7934d9a6cf46aecae00a99c2603d1295e170)
Signed-off-by: Matthew Brost <matthew.brost@intel.com>