openpower/witherspoon: add uart-render-controller package

This change adds a small daemon to monitor the state of the host (power
and video device status), and start/stop the fbterm UART renderer as
appropriate.

Change-Id: I6c7cf7a88e9a19cd87d6b781a4a1519597882345
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
2 files changed