Find a zoned partition automatically

Since we cannot create a gpt table on zoned LU, we cannot make a generic symlink
from it. Instead, let's make it by uevent, "/dev/block/by-name/zoned_device".
Note that, we support only one zoned device in the system.

Bug: 265180564
Change-Id: Ie62b0fd68b77e3e43cf0f5c5cad9503150174271
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>