cherry pick from aosp.

https://android-review.googlesource.com/63805

Fix for Wifi watchdog test when Wifi is not supported

Added a check to see if Wifi is supported like other tests in the class

Signed-off-by: Daniel Kim <daniel.kim@panasonic.aero>

tests/cts/net/src/android/net/wifi/cts/WifiManagerTest.java

@@ -407,6 +407,10 @@ public class WifiManagerTest extends AndroidTestCase {
      * To pass this CTS test, a connected WiFi link is required.
      */
     public void testWifiWatchdog() throws Exception {
+        if (!WifiFeature.isWifiSupported(getContext())) {
+            // skip the test if WiFi is not supported
+            return;
+        }
         // Make sure WiFi is enabled
         if (!mWifiManager.isWifiEnabled()) {
             setWifiEnabled(true);