mt76: set dma-done flag for flushed descriptors

Avoids a theoretical corner case where the hardware could try to process
a stale descriptor after a watchdog reset

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2020-01-20 12:07:09 +01:00
commit 5ffc6b5a98