[SurfaceFlinger] Remove force GPU composition for layers with color transform.

Previously we force GPU composition for all layers with color transform, now
that we move the fallback into hardware composer passthrough, we can remove
this.

BUG: 115554640
Test: Verify by setting a color transform manually.
Change-Id: I6eb75cd30bc23225b10006714b13fb636a146423
1 file changed