Prevent color dithering of firmware bitmaps

BUG=None
TEST=Run 'make' in newbitmaps dir with "clean" removed from the default
step in the Makefile. Use bitmap_viewer to check that the images do not
show grainy color dithering.

Change-Id: I6dff41338a7e54d090bb2f6dedb982fdaa31e657
Reviewed-on: https://gerrit.chromium.org/gerrit/30308
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Ready: Dave Parker <dparker@chromium.org>
Tested-by: Dave Parker <dparker@chromium.org>
1 file changed