Fix imageloader_util manifest generation

generate_imageloader_manifest shouldn't cd into the output directory
because file locations are already relative to the output directory.

BUG=chromium:827363
TEST=generate an imageloader image and verify the manifest contains
     valid sha256 hashes for image.squash and table

Change-Id: I8fd807d1cf81456c2c8aa1ee076c3714d6485e90
Reviewed-on: https://chromium-review.googlesource.com/1198387
Commit-Ready: Michael Giuffrida <michaelpg@chromium.org>
Tested-by: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed