Excluded VR code for Stadia platform support of HDRP

Author: Christophe

PostProcessing/Runtime/Utils/RuntimeUtilities.cs

@@ -781,7 +781,7 @@ public static bool isSinglePassStereoEnabled
             {
 #if UNITY_EDITOR
                 return isSinglePassStereoSelected && Application.isPlaying;
-#elif UNITY_SWITCH
+#elif !ENABLE_VR
                 return false;
 #elif UNITY_2017_2_OR_NEWER
                 return UnityEngine.XR.XRSettings.eyeTextureDesc.vrUsage == VRTextureUsage.TwoEyes;
@@ -800,7 +800,7 @@ public static bool isVREnabled
             {
 #if UNITY_EDITOR
                 return UnityEditor.PlayerSettings.virtualRealitySupported;
-#elif UNITY_XBOXONE || UNITY_SWITCH
+#elif UNITY_XBOXONE || !ENABLE_VR
                 return false;
 #elif UNITY_2017_2_OR_NEWER
                 return UnityEngine.XR.XRSettings.enabled;