virtual/chromeos-bsp: convert to new style virtual

The main tree has converted to a new style chromeos-bsp virtual.  This
causes portage to ignore the old style virtual/chromeos-bsp that some
boards are still using.  Convert to the new style to fix that.

BUG=chromium-os:38567
TEST=`cbuildbot {daisy,stumpy,lumpy}-release` worked

Change-Id: Iac49a3e1a94423f602301b679ad6a7de289b4d78
Reviewed-on: https://gerrit.chromium.org/gerrit/42555
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
26 files changed