[HWUI] Remove hardcoding around wide color gamut.

Previously we hardcode wide color gamut in HWUI as scRGB color space with FP16
pixel format. However, the hardware composer doesn't support this combination.
This patch plumbs wide color gamut composition preference from composer API to
HWUI such that HWUI can now pick the combination of color space and pixel
format for the surface.

BUG: 111436479
Test: Build, flash and boot, verify with a demo app.
Change-Id: I7a8b4d8deca72ef40069dba9d23a3f5e90dbfe5a