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 vr schedulers FIFO.

Change-Id: I234c2cfcba38f6427f77278ad6494a07a497e89b
Signed-off-by: zwliew <zhaoweiliew@gmail.com>
defconfig: r1

Change-Id: Ie0c65eefbf6d2b7f02b257e25fd9122eaed2aec9
Signed-off-by: zwliew <zhaoweiliew@gmail.com>