[roll] Roll fuchsia [kernel][uart] Fix TX irq mask/unmask ordering There is a potential race in some of the uart drivers where a log writer thread is waiting on a TX interrupt, but the irq thread masks the interrupt. This can happen when - 1. Log writer thread is waiting on TX interrupt 2. TX interrupt occurs and the interrupt handler signals blocked threads 3. Before the interrupt handler could set the TX mask, the log writer thread loops back, unmask's TX interrupt and block again on the event. 4. The interrupt handler now masks the TX interrupt 5. TX interrupt will no longer be triggered and hence the logger thread will be blocked forever This CL fixes the issue by first masking the interrupt in the irq handler and then signaling the blocked thread. Original-Bug: 126785 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/853877 Original-Revision: 688263cc9914cb6017dfe09506289b4ebc4180b8 GitOrigin-RevId: bc707294808740f93447c68e1159e87aa19309de Change-Id: Icc24539bc23659079a7a621861ea1a5373ce4b1f
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