crimson/os/seastore: Enable SMR HDD.

crimson/os/seastore: Enable SMR HDD.

SMR HDDs are also zoned block devices similar to ZNS SSDs. SMR
devices have 2 types of zones named as conventional zones which are
random writeable and sequentially-write-required zones, which are
sequentially writable and lend themselves to zone operations like
ZNS SSD zones.

Conventional zones do not respond to zone operations, so to enable
crimson-osd to use SMR HDDs, for now, we don't consider the
conventional zones which generally make up a very small percentage
of the drive capacity.

Signed-off-by: Aravind Ramesh <aravind.ramesh@wdc.com>