block/mq-deadline: Set the fifo_time member also if inserting at head

block/mq-deadline: Set the fifo_time member also if inserting at head

Before commit 322cff70d46c the fifo_time member of requests on a dispatch
list was not used. Commit 322cff70d46c introduces code that reads the
fifo_time member of requests on dispatch lists. Hence this patch that sets
the fifo_time member when adding a request to a dispatch list.

Cc: Christoph Hellwig <[email protected]>
Cc: Ming Lei <[email protected]>
Cc: Damien Le Moal <[email protected]>
Fixes: 322cff70d46c ("block/mq-deadline: Prioritize high-priority requests")
Signed-off-by: Bart Van Assche <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>