mount_gpt_image.sh: drop support for remounting images

Nothing uses this code, so delete it.  Going to make some improvements
in these files which would require updating remount, so it's easier to
punt than migrate unused code.

BUG=None
TEST=precq passes

Change-Id: Icbce3b868c17b1b15f5d5606ea33d4a9d7483903
Reviewed-on: https://chromium-review.googlesource.com/1034228
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Caroline Tice <cmtice@chromium.org>
Reviewed-by: Gwendal Grignou <gwendal@google.com>
2 files changed