Reduce embolden effect. DO NOT MERGE

Cherry-pick of Iec1c478171e33751be1cddbaae6a8ec30bb6cbab

Certain CJK glyphs become essentially unreadable when emboldened at
sizes used by common apps like News/Weather. Reducing embolden
strength slightly makes these glyphs much more readable without
sacrificing bold/normal weight differentiation.

Bug: 6712857
Change-Id: I1025f72b5ed07f0a65924ba58aa19511bc417eb1