Wait twice more for HDMI audio node.

BUG=chromium:682055
TEST=Tested on lab DUT

Change-Id: I85cae0809243f04b63c9a3c4d7abbda7127d131e
Reviewed-on: https://chromium-review.googlesource.com/430218
Commit-Ready: Kalin Stoyanov <kalin@chromium.org>
Tested-by: Kalin Stoyanov <kalin@chromium.org>
Reviewed-by: Ruchi Jahagirdar <rjahagir@chromium.org>
diff --git a/server/site_tests/audio_AudioNodeSwitch/audio_AudioNodeSwitch.py b/server/site_tests/audio_AudioNodeSwitch/audio_AudioNodeSwitch.py
index e38256e..1058f2d 100644
--- a/server/site_tests/audio_AudioNodeSwitch/audio_AudioNodeSwitch.py
+++ b/server/site_tests/audio_AudioNodeSwitch/audio_AudioNodeSwitch.py
@@ -113,7 +113,7 @@
             hdmi_port.apply_edid(edid_lib.Edid.from_file(edid_path))
             time.sleep(self._APPLY_EDID_DELAY)
             hdmi_port.set_plug(True)
-            time.sleep(self._PLUG_DELAY)
+            time.sleep(self._PLUG_DELAY * 2)
 
             audio_test_utils.check_audio_nodes(self.audio_facade,
                                                (['HDMI'], None))