Swanky: Add custom default backlight values

This tunes the default backlight for panels of varying brightness.

BUG=chrome-os-partner:29878, chrome-os-partner:29710
TEST=`emerge-swanky chromeos-bsp-swanky`
Verify file shows up in the build.

Change-Id: Ic5475849b7f961f392ff2404c61663f6ba11511f
Signed-off-by: Anson Tseng <anson.tseng@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/210843
Reviewed-by: Daniel Erat <derat@chromium.org>
3 files changed