HACK: Run e2fsck with -f

Until we figure out what is causing the filesystem
created on hammerhead's factory reset to be invalid,
force e2fsck to run

Bug:24763183
Change-Id: Iff015097ab8c22084f485ce77d5a4c47442bcf7c

fs_mgr/fs_mgr.c

@@ -101,6 +101,7 @@ static void check_fs(char *blk_device, char *fs_type, char *target)
     char tmpmnt_opts[64] = "errors=remount-ro";
     char *e2fsck_argv[] = {
         E2FSCK_BIN,
+        "-f",
         "-y",
         blk_device
     };