Update setHdrConversionStrategy to return the preferredHdrOutput type

Bug: 268336382
Test: atest VtsHalGraphicsComposer3_TargetTest
Change-Id: I6ac912ac8a0329f4ea32acad657e44b473660c42
diff --git a/graphics/composer/aidl/vts/VtsComposerClient.cpp b/graphics/composer/aidl/vts/VtsComposerClient.cpp
index 2e2b193..e03ef25 100644
--- a/graphics/composer/aidl/vts/VtsComposerClient.cpp
+++ b/graphics/composer/aidl/vts/VtsComposerClient.cpp
@@ -344,9 +344,11 @@
             hdrConversionCapability};
 }
 
-ScopedAStatus VtsComposerClient::setHdrConversionStrategy(
+std::pair<ScopedAStatus, common::Hdr> VtsComposerClient::setHdrConversionStrategy(
         const common::HdrConversionStrategy& conversionStrategy) {
-    return mComposerClient->setHdrConversionStrategy(conversionStrategy);
+    common::Hdr preferredHdrOutputType;
+    return {mComposerClient->setHdrConversionStrategy(conversionStrategy, &preferredHdrOutputType),
+            preferredHdrOutputType};
 }
 
 std::pair<ScopedAStatus, common::Transform> VtsComposerClient::getDisplayPhysicalOrientation(