add EROFS apex support.

Signing code uses deapexer to expand payload image, deapexer currently
only supports ext4 payload image expansion using debugfs or
debugfs_static. To support EROFS, need to supply deapexer with
fsck.erofs native binary for EROFS payload expansion.

cherrypick of ag/20154950BUG: b/195515562, b/240288941
Change-Id: Ibf707989f2502bfcf112202a3a6fdb74b6a8dbbc