test_audio: Use skipif to distinguish phone and devkit test

pytests/test_audio.py

+from . import boardtype
+
 import os
 import pytest
 import subprocess
@@ -10,12 +12,20 @@ def tempdir():
         yield tmpdir
 
 
+@pytest.mark.skipif(not boardtype.is_devkit(), reason="Not a devkit")
 def test_sgtl5000():
     "Check if the sgtl5000 audio codec is there"
     out = subprocess.check_output(["aplay", "-l"])
     assert b"[sgtl5000]" in out
 
 
+@pytest.mark.skipif(not boardtype.is_librem5(), reason="Not a phone")
+def test_wm8962():
+    "Check if the audio codec is there"
+    out = subprocess.check_output(["aplay", "-l"])
+    assert b"[wm8962]" in out
+
+
 def test_headphone_detection():
     "Check if we registered the headphone detection IRQ"
     f = open("/proc/interrupts")