openpower/witherspoon: add fbterm package for UART rendering

This change adds a definition for fbterm, customised for rendering UART
data to a local framebuffer device.

fbterm upstream isn't very active - last release was in 2008. So, use a
newer git tree, which includes a couple of fixes and customisations for
our usage in uart rendering.

Change-Id: Ib19e879283548dbe403401b6fecfaaeb8cf74c1c
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
4 files changed