Adjust f2fs_sparseblock for libf2fs changes

Supporting 4k and 16k at the same time requires some libf2fs changes, so
f2fs_sparseblock needs to adapt to the changes

Test: Builds
Bug: 279820706
Change-Id: I39d935b3e15a65e48f6f765d035cccab5f6e193c
1 file changed