Rename getAllNetworkStateSnapshot which should be pluralized

Address API review feedback, ConnectivityManager#getAllNetworkStateSnapshot
should be pluralized so rename the method to getAllNetworkStateSnapshots

Bug: 183972554
Test: make, FrameworksNetTests
      FrameworksServicesTests
Change-Id: Ic18d17d05984fa2466c962c7843c0ef7183ce77c
diff --git a/framework/src/android/net/IConnectivityManager.aidl b/framework/src/android/net/IConnectivityManager.aidl
index 728f375..c434bbc 100644
--- a/framework/src/android/net/IConnectivityManager.aidl
+++ b/framework/src/android/net/IConnectivityManager.aidl
@@ -82,7 +82,7 @@
     @UnsupportedAppUsage(maxTargetSdk = 30, trackingBug = 170729553)
     NetworkState[] getAllNetworkState();
 
-    List<NetworkStateSnapshot> getAllNetworkStateSnapshot();
+    List<NetworkStateSnapshot> getAllNetworkStateSnapshots();
 
     boolean isActiveNetworkMetered();