ucm2: Qualcomm: x1e80100: add number of channels

Describe number of playback channels for speakers (where it is not
obvious: 4 channels) and headphones.

Closes: #396
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

ucm2/Qualcomm/x1e80100/HiFi.conf

@@ -28,6 +28,7 @@ SectionDevice."Speaker" {
 	Include.wsaspk.File "/codecs/wsa884x/four-speakers/SpeakerSeq.conf"
 
 	Value {
+		PlaybackChannels 4
 		PlaybackPriority 100
 		PlaybackPCM "hw:${CardId},1"
 		PlaybackMixer "default:${CardId}"