glk/sof-cs42l42: add dmic split

glk/sof-cs42l42/HiFi.conf

@@ -13,6 +13,44 @@ SectionVerb {
 	]
 }
 
+# Split 4ch dmic into 2 virtual 2ch mics
+Include.pcm_split.File "/conf.d/dmic-common/split.conf"
+
+Macro [
+	{
+		SplitPCM {
+			Name "glk_stereo_in"
+			Direction Capture
+			Format S32_LE
+			Channels 2
+			HWChannels 4
+			HWChannelPos0 FL
+			HWChannelPos1 FR
+			HWChannelPos2 FL
+			HWChannelPos3 FR
+		}
+	}
+]
+
+Include.ctl_remap.File "/conf.d/dmic-common/remap.conf"
+
+Macro [
+	{
+		CtlRemapStereoVolSw {
+			Dst "Mic 1 Capture"
+			Index0 0
+			Index1 1
+		}
+	}
+	{
+		CtlRemapStereoVolSw {
+			Dst "Mic 2 Capture"
+			Index0 2
+			Index1 3
+		}
+	}
+]
+
 SectionDevice."Speaker" {
 	Comment "Speaker"
 
@@ -55,6 +93,17 @@ SectionDevice."Mic" {
 		CapturePCM "hw:${CardId},99"
 		CaptureChannels 4
 	}
+	Macro.pcm_split.SplitPCMDevice {
+		Name "glk_stereo_in"
+		Direction Capture
+		Device 99
+		HWChannels 4
+		Channels 2
+		Channel0 0
+		Channel1 1
+		ChannelPos0 FL
+		ChannelPos1 FR
+	}
 }
 
 SectionDevice."Headset" {