[ACTS] unlock device before starting suggestion test

Bug: 155891556
Test: acts WifiNetworkSuggestionTest
Change-Id: Ib1afd8506b93a48c847581008ba3da8401a909e7
diff --git a/acts/tests/google/wifi/WifiNetworkSuggestionTest.py b/acts/tests/google/wifi/WifiNetworkSuggestionTest.py
index 2321a71..9099487 100644
--- a/acts/tests/google/wifi/WifiNetworkSuggestionTest.py
+++ b/acts/tests/google/wifi/WifiNetworkSuggestionTest.py
@@ -112,6 +112,7 @@
     def setup_test(self):
         self.dut.droid.wakeLockAcquireBright()
         self.dut.droid.wakeUpNow()
+        self.dut.unlock_screen()
         self.clear_user_disabled_networks()
         wutils.wifi_toggle_state(self.dut, True)
         self.dut.ed.clear_all_events()