fs_mgr: replace make_ext4 api with e2fsprogs

Execute mke2fs to create empty ext4 filesystem.
Execute e2fsdroid to initialize selinux context.

Test: zero-out first 4k of data partition and reboot,
      fs_mgr successfully formats /data.
Bug: 35219933
Change-Id: If6f72f62c618c64be703b83f0114a4dd0a2b079f
Merged-In: If6f72f62c618c64be703b83f0114a4dd0a2b079f