zink: force-add usage when adding last-ref tracking
this fixes desync+crash when: 1. usage is added for bs A 2. tracking is added for bs B 3. tracking is removed for bs B 4. context is destroyed 5. usage A is now dangling and will crash if accessed as seen in glmark2 cc: mesa-stable Reviewed-by:Dave Airlie <airlied@redhat.com> Part-of: <mesa/mesa!15429>
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