Enable FP16 (FFXM_HALF keyword) usage by default

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/ASRUpscaler.cs

@@ -17,7 +17,7 @@ namespace UnityEngine.Rendering.PostProcessing
 		public override void CreateContext(PostProcessRenderContext context, Upscaling config)
 		{
 			// Initialize ASR context
-			Asr.InitializationFlags flags = 0;
+			Asr.InitializationFlags flags = Asr.InitializationFlags.EnableFP16Usage;
 			if (context.camera.allowHDR) flags |= Asr.InitializationFlags.EnableHighDynamicRange;
 			if (config.exposureSource == Upscaling.ExposureSource.Auto) flags |= Asr.InitializationFlags.EnableAutoExposure;
 			if (RuntimeUtilities.IsDynamicResolutionEnabled(context.camera)) flags |= Asr.InitializationFlags.EnableDynamicResolution;