The setup_board script now inserts a BOARD_USE value into
/build/<board>/etc/make.conf.board_setup. This only happens the first
time the board is setup, so this upgrade script inserts that value
for boards that were previously set up.
BUG=chromium-os:20341
TEST=Ran run_chroot_version_hooks in chroot, inspected make.conf.board_setup
files for boards that did and did not have BOARD_USE already set.
Change-Id: I333198a0434076a5e8e50db6affc81ea2076d301
Reviewed-on: http://gerrit.chromium.org/gerrit/7653
Reviewed-by: David James <davidjames@chromium.org>
Tested-by: Matt Tennant <mtennant@chromium.org>
