ucm2: HDA: Create microphone devices optionally

Check if 'Capture Switch' is present before HiFi-mic.conf file
is included.

Link: alsa-project#673
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

Author: perexg

ucm2/HDA/HiFi-analog.conf

@@ -142,7 +142,13 @@ If.spk {
 	}
 }
 
-Include.hifi-mic.File "/HDA/HiFi-mic.conf"
+If.cap-sw {
+	Condition {
+		Type ControlExists
+		Control "name='Capture Switch'"
+	}
+	True.Include.hifi-mic.File "/HDA/HiFi-mic.conf"
+}
 
 If.line {
 	Condition {