The old exynos4x12 lights HAL had logic for scaling the brightness of
lights according to the light's type and also scaling each R/G/B colour.
Bring this logic across, and make the battery LED not eye-searing at
night.
Based on work by Daniel Hillenbrand.
REGRESSION-66
Change-Id: Ia6108468f57c3b6c6a1a68da76a1c3362fd982a5
Simon Shields