ryu: enable tftp netboot output on display

There are 2 different display paths within depthcharge. vboot
has its own as well as the netboot path. For ryu we utilized
the vboot API. However, the netboot path assumes everything is
ready to go w/o any intervention. That's not always true. Correct
this by initializing the display.

BUG=None
TEST=Built and ran netboot image. Observed console.

Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Change-Id: I0ee5d9fd57499929ffbc15b4e4f643bd13793535
Reviewed-on: https://chromium-review.googlesource.com/231694
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
4 files changed