autotest: Change the headphone type on Drallion

According to the HiFi.conf on Drallion, the headphone type is set to
LINEOUT. We should enable the change in autotest to avoid failing test.

In addition, fix the format issue in the file.

BUG=b:148174197
TEST=None

Change-Id: Ib1930aebd8a90420c1960b3c1c5f00d11ab97b35
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/2576222
Tested-by: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Auto-Submit: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Reviewed-by: En-Shuo Hsu <enshuo@chromium.org>
Commit-Queue: En-Shuo Hsu <enshuo@chromium.org>
diff --git a/client/cros/audio/audio_spec.py b/client/cros/audio/audio_spec.py
index 8a6aaf3..5b41d36 100644
--- a/client/cros/audio/audio_spec.py
+++ b/client/cros/audio/audio_spec.py
@@ -64,7 +64,7 @@
 
     """
     if board_name.endswith("-kernelnext"):
-      return board_name[:-len("-kernelnext")]
+        return board_name[:-len("-kernelnext")]
 
     return board_name
 
@@ -202,6 +202,7 @@
 
 HEADPHONE_NODE = {
         ('sarien'): 'LINEOUT',
+        ('drallion'): 'LINEOUT',
 }