mkfs.f2fs: introduce zone align for main area
mkfs.f2fs: introduce zone align for main area

This patch calculate main area begin from a new zone,
avoid misalign if segments per zone is not 1.

Change-Id: Ibda5849c9465fe811aaca6d217e8b7f2971e1c5a
Signed-off-by: Yunlei He <82991dcc9aca727f8eb07b1d23f4d33fb1922a16@huawei.com>
Signed-off-by: Shuoran Liu <593230fec51226593e42ddb98946709bdfbf7345@huawei.com>
Signed-off-by: Jaegeuk Kim <71255387a32c360dfbe6dfb7aaeb123bf1dc8cb6@kernel.org>

TeamTwisted/android_external_f2fs-tools,TeamTwisted/android_external_f2fs-tools