Expose ConnectivityManager#TYPE_WIFI_P2P as SystemApi

Support wifi mainline module usage.

Bug: 135998869
Test: Build and make system-api-stubs-docs-update-current-api
      atest FrameworksNetTests

Change-Id: I77cb45e6b2aaf4ab2c457cb59ccf77b1b8c01fa9
diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index 929edf0..18ef0ef 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -662,7 +662,7 @@
      * {@hide}
      */
     @Deprecated
-    @UnsupportedAppUsage
+    @SystemApi
     public static final int TYPE_WIFI_P2P    = 13;
 
     /**