factory_install: Add -y to e2fsck.

Allow e2fsck to run without user interaction.

BUG=None
TEST=None

Change-Id: Ie3b59b70d25170fadd3d2b9e46fef9941d9e591b
Reviewed-on: https://chromium-review.googlesource.com/877659
Commit-Ready: Hung-Te Lin <hungte@chromium.org>
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
1 file changed