Revert "HACK: Run e2fsck with -f"

This reverts commit 2cd762d9.

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