Add 7-segment display daemon

This daemon takes the path of a 7-segment display device node as its
argument and then writes POST codes which were received over D-Bus to
that device.

Signed-off-by: Benjamin Fair <benjaminfair@google.com>
Change-Id: Ic00548c3ebb5a7aa3c9a927c2de748595eb90e71
5 files changed