Revert "fs_mgr: let fsck.f2fs actually attempt a fix"

fsck.f2fs will correctly fix when it's required, without the -f flag.

This reverts commit eb6036ac.

Change-Id: Iec9ca5e593b61f24b02db30bff7089fafee7635e
Reviewed-on: http://gerrit.mot.com/721774


SLTApproved: Slta Waiver <sltawvr@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Christopher Fries <cfries@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>