conf: add support for Amlogic AIU and AXG cards

The generic AIU conf is used with Amlogic GXBB/GXL/GXM boards and
supports HDMI and hinted S/PDIF output. The generic AXG conf is
used with G12A/G12B/SM1 boards and supports HDMI.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>

src/conf/cards/axg-sound-card.conf

@@ -0,0 +1,65 @@
+#
+# Configuration for Amlogic AXG audio
+#
+
+axg-sound-card.pcm.default {
+	@args [ CARD  ]
+	@args.CARD {
+		type string
+	}
+	type softvol
+	slave.pcm {
+		type plug
+		slave {
+			pcm {
+				type hw
+				card $CARD
+				device 0
+			}
+		}
+	}
+	control {
+		name "PCM Playback Volume"
+		card $CARD
+	}
+}
+
+<confdir:pcm/hdmi.conf>
+
+axg-sound-card.pcm.hdmi.0 {
+	@args [ CARD AES0 AES1 AES2 AES3 ]
+	@args.CARD {
+		type string
+	}
+	@args.AES0 {
+		type integer
+	}
+	@args.AES1 {
+		type integer
+	}
+	@args.AES2 {
+		type integer
+	}
+	@args.AES3 {
+		type integer
+	}
+	type hooks
+	slave.pcm {
+		type hw
+		card $CARD
+		device 0
+	}
+	hooks.0 {
+		type ctl_elems
+		hook_args [
+			{
+				name "IEC958 Playback Default"
+				interface PCM
+				lock true
+				preserve true
+				optional true
+				value [ $AES0 $AES1 $AES2 $AES3 ]
+			}
+		]
+	}
+}