fs_mgr: support metadata_csum for ext4 partition

The metadata_csum can enhance ext4 stability, so this patch adds a way to
enable it.

Requiring "metadata_csum" in fsmgr flag of fstab.

Bug: 149039306
Change-Id: I618a65d7afc63a617f5f2582c93002af7f8e7234
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
4 files changed