Tools: Topology: Add channels downnmix to nocodec topologies

This patch adds to PCM0 playback pipeline the selector/micsel
component to allow playback of 1-8ch content with conversion
to stereo. Mono input is upmixed, multi-channel input is
downmixed.

Currently the topology sets for micsel a blob
downmix_71_to_stereo_with_lfe.conf. If works generally fairly
well for all channels counts except that mono input is copied
to left playback while right remains silent, not to both.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

Author: singalsu

tools/topology/topology2/cavs-nocodec.conf

@@ -19,6 +19,7 @@
 <dai-kpb-be.conf>
 <wov-detect.conf>
 <host-copier-gain-mixin-playback.conf>
+<host-copier-micsel-gain-mixin-playback.conf>
 <host-copier-gain-src-mixin-playback.conf>
 <mixout-gain-dai-copier-playback.conf>
 <mixout-gain-smart-amp-dai-copier-playback.conf>
@@ -205,23 +206,30 @@ Object.Dai.SSP [
 # PCM2 ---> gain ---> SRC ---> Mixin  ---> Mixout ---> gain ---> SSP2
 # PCM4 ---> gain ---> Mixin -------------------------->\
 # PCM3 ---> gain ---> Mixin ---->\                      \
-# PCM0 ---> gain ---> Mixin ---> Mixout ---> Mixin ---> Mixout ---> gain ---> smart_amp ---> SSP0
-#                                                                             /
-#    /---------------------------------------------------------------------->/
-# SSP0 ---> PCM0
+# PCM0 ---> micsel ---> gain ---> Mixin ---> Mixout ---> Mixin ---> Mixout ---> gain ---> smart_amp ---> SSP0
+#                                                                                         /
+#    /---------------------------------------------------------------------------------->/
+# SSP0 ---> gain ---> module-copier ---> gain ---> micsel ---> PCM0
+#                                 \----> gain ---------------> PCM0.1
 # SSP1 ---> PCM1
 # SSP2 ---> SRC ---> PCM2
 
 IncludeByKey.PASSTHROUGH {
 "false" {
-		Object.Pipeline.host-copier-gain-mixin-playback [
+		Object.Pipeline.host-copier-micsel-gain-mixin-playback [
 			{
 				index	1
 
 				Object.Widget.host-copier.1 {
 					stream_name 'SSP0 Playback'
 					pcm_id 0
 				}
+				Object.Widget.micsel.1 {
+					Object.Control.bytes.1 {
+						name 'Pre Mixer $SSP0_PCM_NAME Playback Micsel Bytes'
+						<include/components/micsel/downmix_71_to_stereo_with_lfe.conf>
+					}
+				}
 				Object.Widget.gain.1 {
 					curve_type "windows_fade"
 					Object.Control.mixer.1 {
@@ -1015,6 +1023,12 @@ Object.PCM.pcm [
 					rates '192000'
 				}
 			}
+			IncludeByKey.PASSTHROUGH {
+				"false" {
+					channels_min	1
+					channels_max	8
+				}
+			}
 		}
 
 		Object.PCM.pcm_caps.2 {
@@ -1236,7 +1250,7 @@ IncludeByKey.PASSTHROUGH {
 			}
 			{
 				source 'host-copier.0.playback'
-				sink 'gain.1.1'
+				sink 'micsel.1.1'
 			}
 			{
 				source 'host-copier.2.playback'