libchromeos: Remove display size flags for Pixel & Peppy

Chrome now gets the display size from frecon at startup. Clean up the
old flags for Pixel & Peppy.

BUG=none
TEST=build & boot link_freon

Change-Id: I28ca3b205c361889167b4cda99194f1bc67af593
Reviewed-on: https://chromium-review.googlesource.com/266564
Trybot-Ready: Michael Spang <spang@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Tested-by: Michael Spang <spang@chromium.org>
1 file changed