acts: correct band "any" to new softap band 2+5G

Bug: 150398900
Test: act.py -c -tc WifiSoftApAcsTest:test_softap_auto_clean_env
Change-Id: I3ea2b37d8f19c2042459c6d230e369882adf351c
diff --git a/acts/tests/google/wifi/WifiSoftApAcsTest.py b/acts/tests/google/wifi/WifiSoftApAcsTest.py
index c130098..a2cf41e 100644
--- a/acts/tests/google/wifi/WifiSoftApAcsTest.py
+++ b/acts/tests/google/wifi/WifiSoftApAcsTest.py
@@ -34,7 +34,7 @@
 from threading import Thread
 
 WifiEnums = wutils.WifiEnums
-WIFI_CONFIG_APBAND_AUTO = -1
+WIFI_CONFIG_APBAND_AUTO = WifiEnums.WIFI_CONFIG_SOFTAP_BAND_2G_5G
 
 class WifiSoftApAcsTest(WifiBaseTest):
     """Tests for Automatic Channel Selection.