topology2: pipelines: cavs: Add a new tone generator pipeline

Add a new hostless tone generator pipeline. The virtual widget of type
input at the source is mainly for getting the PCM ioctls to propagate to
the BE with DPCM.

Signed-off-by: Ranjani Sridharan <[email protected]>

Author: ranj063

tools/topology/topology2/include/pipelines/virtual-siggen-mixin-playback.conf

@@ -0,0 +1,70 @@
+#
+# Tone playback pipeline: virtual-siggen-mixin-playback
+#
+# All attributes defined herein are namespaced
+# by alsatplg to "Object.Pipeline.virtual-siggen-mixin-playback.N.attribute_name"
+#
+# Usage: virtual-siggen-mixin-playback pipeline object can be instantiated as:
+#
+# Object.Pipeline.virtual-siggen-mixin-playback."N" {
+# 	period		1000
+# 	time_domain	"timer"
+# }
+#
+# Where N is the unique pipeline ID within the same alsaconf node.
+#
+
+<include/common/input_audio_format.conf>
+<include/common/output_audio_format.conf>
+<include/components/mixin.conf>
+<include/components/siggen.conf>
+<include/components/pipeline.conf>
+
+Class.Pipeline."virtual-siggen-mixin-playback" {
+
+	<include/pipelines/pipeline-common.conf>
+
+	attributes {
+		!constructor [
+			"index"
+		]
+
+		!immutable [
+			"direction"
+		]
+
+		#
+		# virtual-siggen-mixin-playback objects instantiated within the same alsaconf node must have
+		# unique pipeline_id attribute
+		#
+		unique	"instance"
+	}
+
+	Object.Widget {
+		virtual.1 {
+			type	"input"
+		}
+
+		siggen.1 {}
+
+		mixin.1 {}
+
+		pipeline.1 {
+			priority	0
+			lp_mode		0
+		}
+	}
+
+	Object.Base {
+		!route [
+			{
+				source	siggen.$index.1
+				sink	mixin.$index.1
+			}
+		]
+	}
+
+	direction	"playback"
+	dynamic_pipeline 1
+	time_domain	"timer"
+}