Remove PQ/HLG tonemap tests in RenderEngine

OEMs did not reliably implement the CPU tonemapper, and these tests aren't tied to certification, so they fail on real devices. We're moving away from libtonemap in general in favor or sharing LUTs, so these tests wouldn't be useful moving forward anyway.

Bug: 357103962
Flag: EXEMPT test only
Test: courage
Change-Id: I4db9f11b42dae37d733bfb189ef2309bc41399f0