block: Allow 0ms deadline latency, increase the read speed
 Change a timer compare from after to after-equals, thus allowing 0 timeout
 and making deadline, sio and zen schedulers FIFO.

Change-Id: I0ef13dde5492b936cd52c7fb7666eabf4ddd0c02
Signed-off-by: zwliew <zhaoweiliew@gmail.com>