WifiManager(aidl): Remove pingSupplicant binder call

This is now deprecated in the public API and instead calls
isWifiEnabled(). So, remove this AIDL call.

Bug: 36493092
Test: Compiles
Change-Id: I6339d5bb18f423d84fa9222a87e2df7eb9c336a9
Merged-In: I6339d5bb18f423d84fa9222a87e2df7eb9c336a9
diff --git a/wifi/java/android/net/wifi/IWifiManager.aidl b/wifi/java/android/net/wifi/IWifiManager.aidl
index 10ffd8a..1852feb 100644
--- a/wifi/java/android/net/wifi/IWifiManager.aidl
+++ b/wifi/java/android/net/wifi/IWifiManager.aidl
@@ -81,8 +81,6 @@
 
     boolean disableNetwork(int netId);
 
-    boolean pingSupplicant();
-
     void startScan(in ScanSettings requested, in WorkSource ws);
 
     List<ScanResult> getScanResults(String callingPackage);