Revert "HACK: Run e2fsck with -f"

This reverts commit 2cd762d932.

This change adds 12 seconds or so to boot times - we need to revert it
and see if we can find a proper fix to the original problem if it is
still occurring.

Bug: 27849759
Change-Id: Ib3692e436c08468a51529f256f2ce5e9ccd2d35d

fs_mgr/fs_mgr.c

@@ -101,7 +101,6 @@ 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
     };