CHANGE: Enable XR support on Switch (#1252).

Author: utjkaz

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -15,6 +15,7 @@ however, it has to be formatted properly to pass verification tests.
   * This allows for certain optimizations.
   * Should the limits prove too tight, they can be raised in the future.
   * The most complex device we have at the moment (`Touchscreen`) has 242 controls and 616 bytes of state.
+- Enabled XR device support on Switch.
 
 ### Fixed
 

Packages/com.unity.inputsystem/InputSystem/InputSystem.cs

@@ -3156,7 +3156,7 @@ private static void PerformDefaultPluginInitialization()
             Switch.SwitchSupportHID.Initialize();
             #endif
 
-            #if (UNITY_EDITOR || UNITY_STANDALONE || UNITY_ANDROID || UNITY_IOS || UNITY_WSA) && UNITY_INPUT_SYSTEM_ENABLE_XR && ENABLE_VR
+            #if (UNITY_EDITOR || UNITY_STANDALONE || UNITY_ANDROID || UNITY_IOS || UNITY_WSA || UNITY_SWITCH) && UNITY_INPUT_SYSTEM_ENABLE_XR && ENABLE_VR
             XR.XRSupport.Initialize();
             #endif