SurfaceControl: Add colorTransform to DisplayInfo

Adds the colorTransform field, which defines a vendor-specific color
transform (e.g., wide gamut, sRGB, etc.) to the PhysicalDisplayInfo
class, and populates it from the corresponding field from
ISurfaceComposer.

Bug: 20853317
Change-Id: Ic59ca5142bdaa73c42d9c044d7aae345255f1dad