f2fs: zone: fix to remove pow2 check condition for zoned block device

Commit 2e2c6e9b ("f2fs: remove power-of-two limitation of zoned
device") missed to remove pow2 check condition in init_blkz_info(),
fix it.

Fixes: 2e2c6e9b ("f2fs: remove power-of-two limitation of zoned device")
Signed-off-by: Feng Song <songfeng@oppo.com>
Signed-off-by: Yongpeng Yang <yangyongpeng1@oppo.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>