Add conversion script to convert 2GB boards to 32bit.

BUG=chromium-os:30820
TEST=Launch incremental buildbots for these overlays and confirm they
     are converted to 32bit successfully.

Change-Id: I5ba9294d8b00204110c304a48c0c5f3c0cae9751
Reviewed-on: https://gerrit.chromium.org/gerrit/22497
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Sonny Rao <sonnyrao@chromium.org>
Tested-by: David James <davidjames@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/22750
Reviewed-by: Brian Harring <ferringb@chromium.org>
1 file changed