sof-soundwire: Add basic support for basic cs35l56 configurations

cs35l56 is a boosted speaker amp, add UCM support for configurations
with up to 8 amps.

Closes: #370
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

ucm2/sof-soundwire/cs35l56.conf

@@ -0,0 +1,40 @@
+# Use case Configuration for sof-soundwire card
+
+#
+# Arguments:
+#   ForAmps - regex filter for var:SpeakerAmps
+#   Amp - amplifier number 1-8
+#
+DefineMacro.cs42l43spk.If.0 {
+	Condition {
+		Type RegexMatch
+		Regex "${var:__ForAmps}"
+		String "${var:SpeakerAmps}"
+	}
+	True {
+		EnableSequence [
+			cset "name='AMP${var:__Amp} Speaker Switch' 1"
+		]
+		DisableSequence [
+			cset "name='AMP${var:__Amp} Speaker Switch' 0"
+		]
+	}
+}
+
+SectionDevice."Speaker" {
+	Comment "Speaker"
+
+	Macro.num1.cs42l43spk { ForAmps "[1-8]" Amp 1 }
+	Macro.num2.cs42l43spk { ForAmps "[2-8]" Amp 2 }
+	Macro.num3.cs42l43spk { ForAmps "[3-8]" Amp 3 }
+	Macro.num4.cs42l43spk { ForAmps "[4-8]" Amp 4 }
+	Macro.num5.cs42l43spk { ForAmps "[5-8]" Amp 5 }
+	Macro.num6.cs42l43spk { ForAmps "[6-8]" Amp 6 }
+	Macro.num7.cs42l43spk { ForAmps "[78]" Amp 7 }
+	Macro.num8.cs42l43spk { ForAmps "8" Amp 8 }
+
+	Value {
+		PlaybackPriority 100
+		PlaybackPCM "hw:${CardId},2"
+	}
+}