mainboard/google/reef: add pen connections

A pen interface was added. Prepare for possibly testing it by
plumbing in the gpio configuration. It's very possible these
changes need to be tweaked, but no driver code has been seen
yet nor a datasheet detailing how some of these signals actually
function.

BUG=chrome-os-partner:56739

Change-Id: I208ff3e151ce55d62e5fcc33a1e39cc87e229970
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/16376
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

0 files changed, 0 insertions, 0 deletions