Support fp16 in sf

* Make sure we don't dim SDR in renderengine, and instead map HDR to the
  correct relative luminance above 1.0
* Plumb the HDR/SDR ratio into HWC

Bug: 236745178
Test: builds
Change-Id: I325972a01280d287189d38dd6c5bf7f2d4b776bb
diff --git a/services/surfaceflinger/DisplayHardware/HidlComposerHal.h b/services/surfaceflinger/DisplayHardware/HidlComposerHal.h
index 5c19b47..c768d27 100644
--- a/services/surfaceflinger/DisplayHardware/HidlComposerHal.h
+++ b/services/surfaceflinger/DisplayHardware/HidlComposerHal.h
@@ -226,7 +226,8 @@
      */
     Error setClientTarget(Display display, uint32_t slot, const sp<GraphicBuffer>& target,
                           int acquireFence, Dataspace dataspace,
-                          const std::vector<IComposerClient::Rect>& damage) override;
+                          const std::vector<IComposerClient::Rect>& damage,
+                          float hdrSdrRatio) override;
     Error setColorMode(Display display, ColorMode mode, RenderIntent renderIntent) override;
     Error setColorTransform(Display display, const float* matrix) override;
     Error setOutputBuffer(Display display, const native_handle_t* buffer,