[ConfigStore] Return data space and pixel format for wide color gamut.

To proceed down to the route where default composition preference and wide
color gamut composition preference are different, we want to return the
configuration for wide color gamut composition preference. This patch extends
the previous composition preference API to return wide color gamut composition
preference.

BUG: 111436479
Test: Build, flash and run tests.
Change-Id: I88b22c01d9d9ec75f4bb7f4ef477d3eae0e0db87