Accomodate brightness space change for client target

Previous the hal reported a white point in nits. Since nits are being
removed from the composer interface, SurfaceFlinger converts a dimming
ratio reported by composer into a white point instead.

Bug: 217961164
Test: builds, boots
Change-Id: I9ceec3af80f503df0debe434bb454ec42694811b
Merged-In: I9ceec3af80f503df0debe434bb454ec42694811b
diff --git a/services/surfaceflinger/DisplayHardware/HidlComposerHal.cpp b/services/surfaceflinger/DisplayHardware/HidlComposerHal.cpp
index 95d7b58..f735bba 100644
--- a/services/surfaceflinger/DisplayHardware/HidlComposerHal.cpp
+++ b/services/surfaceflinger/DisplayHardware/HidlComposerHal.cpp
@@ -1297,9 +1297,9 @@
 
 Error HidlComposer::getClientTargetProperty(
         Display display, IComposerClient::ClientTargetProperty* outClientTargetProperty,
-        float* outWhitePointNits) {
+        float* outBrightness) {
     mReader.takeClientTargetProperty(display, outClientTargetProperty);
-    *outWhitePointNits = -1.f;
+    *outBrightness = 1.f;
     return Error::NONE;
 }