updater: Update the mkfs.f2fs argument to match f2fs-tools 1.8.0.

Commit adeb41a8 has switched the
argument for recovery. This CL handles the case for updater.

Note that there's a chance the updater may run against the old
recovery (and f2fs 1.4.1 binary). Not sending a 0-sector argument to
f2fs 1.4.1 also works.

Bug: 37758867
Test: Make an OTA package that calls format f2fs, with mkfs.f2fs 1.8.0
      and 1.4.1 binaries respectively.
Change-Id: I4d4bbe8c57544d1c514b7aa37fbf22a0aab14e2c