SF: DisplayCommand.colorTransform is just a matrix

Remove the hint from DisplayCommand.colorTransform as currently
we only use ColorTransform::IDENTITY and ColorTransform::ARBITRARY_MATRIX,
which both can be expressed using a matrix.

Bug: 208879711
Test: VTS
Change-Id: I1c335647aabb7f89c2c89e54abfc839d10a659fb
diff --git a/services/surfaceflinger/DisplayHardware/HidlComposerHal.h b/services/surfaceflinger/DisplayHardware/HidlComposerHal.h
index fdb2cbd..8190c17 100644
--- a/services/surfaceflinger/DisplayHardware/HidlComposerHal.h
+++ b/services/surfaceflinger/DisplayHardware/HidlComposerHal.h
@@ -227,7 +227,7 @@
                           int acquireFence, Dataspace dataspace,
                           const std::vector<IComposerClient::Rect>& damage) override;
     Error setColorMode(Display display, ColorMode mode, RenderIntent renderIntent) override;
-    Error setColorTransform(Display display, const float* matrix, ColorTransform hint) override;
+    Error setColorTransform(Display display, const float* matrix) override;
     Error setOutputBuffer(Display display, const native_handle_t* buffer,
                           int releaseFence) override;
     Error setPowerMode(Display display, IComposerClient::PowerMode mode) override;