zbd: allow block size not divisor of zone size

zbd: allow block size not divisor of zone size

Current implementation checks that block size is divisor of zone size
when verify work load is specified. After the recent fix of block size
unaligned to zone, this check is no longer valid. Remove the check.

The check had been valid since such block size left unwritten area at
each zone end and keeps the zones in open/active status until verify
read is done. It easily hit max open/active zones limitation. After the
fix, the zones with unwritten area are finished then they do not hit the
limitation.

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Tested-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
Reviewed-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
Signed-off-by: Vincent Fu <vincent.fu@samsung.com>