topology2: sdw-amp-generic: Remove hardcoded number of feedback channels

Replace the hardcoded assumption of 2 feedback channels per link

A new constant AMP_FEEDBACK_CH_PER_LINK is added to set the number of
channels for the link BE DAI, replacing the original hardcoded value
of 2.

The default values are:
  For NUM_SDW_AMP_LINKS=1:
    AMP_FEEDBACK_CH=2, AMP_FEEDBACK_CH_PER_LINK=2

  For NUM_SDW_AMP_LINKS=2:
    AMP_FEEDBACK_CH=4, AMP_FEEDBACK_CH_PER_LINK=2

The alh-copier definition has been rewritten so that it is based only on
AMP_FEEDBACK_CH, instead of making assumptions from NUM_SDW_AMP_LINKS.
It supports 2 or 4 total feedback channels. Support for 1 and 3 feedback
channels has not been included because these are unusual and the code is
smaller without them. They can be added later if they are needed.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>

tools/topology/topology2/platform/intel/sdw-amp-generic.conf

@@ -8,6 +8,7 @@ Define {
 	SDW_AMP_BE_ID 2
 	SDW_AMP_IN_BE_ID 3
 	AMP_FEEDBACK_CH 2
+	AMP_FEEDBACK_CH_PER_LINK 2
 	SDW_AMP_FEEDBACK true
 }
 
@@ -181,6 +182,7 @@ IncludeByKey.NUM_SDW_AMP_LINKS {
 "2"	{
 		Define {
 			AMP_FEEDBACK_CH 4
+			AMP_FEEDBACK_CH_PER_LINK 2
 		}
 
 		Object.Widget {
@@ -353,7 +355,7 @@ IncludeByKey.SDW_AMP_FEEDBACK {
 				name		$SDW_SPK_IN_STREAM
 				default_hw_conf_id	1
 				rate			48000
-				channels		2
+				channels		$AMP_FEEDBACK_CH_PER_LINK
 
 				Object.Base.hw_config.1 {
 					id	1
@@ -386,47 +388,45 @@ IncludeByKey.SDW_AMP_FEEDBACK {
 					num_output_audio_formats 1
 					num_output_pins 1
 
-					IncludeByKey.NUM_SDW_AMP_LINKS {
-					"2"	{
-							Object.Base.input_audio_format [
-								{
-									in_channels		4
-									in_bit_depth		32
-									in_valid_bit_depth	$SDW_LINK_VALID_BITS
+					Object.Base.input_audio_format [
+						{
+							in_channels		$AMP_FEEDBACK_CH
+							in_bit_depth		32
+							in_valid_bit_depth	$SDW_LINK_VALID_BITS
+
+							IncludeByKey.AMP_FEEDBACK_CH {
+								"2" {
+									in_ch_cfg	$CHANNEL_CONFIG_STEREO
+									in_ch_map	$CHANNEL_MAP_STEREO
+								}
+								"4" {
 									in_ch_cfg	$CHANNEL_CONFIG_3_POINT_1
 									in_ch_map	$CHANNEL_MAP_3_POINT_1
-									in_sample_type		$SAMPLE_TYPE_MSB_INTEGER
-									in_fmt_cfg		"$[($in_channels | ($in_valid_bit_depth * 256))]"
 								}
-							]
-							Object.Base.output_audio_format [
-								{
-									out_channels		4
-									out_bit_depth		32
-									out_valid_bit_depth	32
+							}
+
+							in_sample_type		$SAMPLE_TYPE_MSB_INTEGER
+							in_fmt_cfg		"$[($in_channels | ($in_valid_bit_depth * 256))]"
+						}
+					]
+					Object.Base.output_audio_format [
+						{
+							out_channels		$AMP_FEEDBACK_CH
+							out_bit_depth		32
+							out_valid_bit_depth	32
+
+							IncludeByKey.AMP_FEEDBACK_CH {
+								"2" {
+									out_ch_cfg	$CHANNEL_CONFIG_STEREO
+									out_ch_map	$CHANNEL_MAP_STEREO
+								}
+								"4" {
 									out_ch_cfg	$CHANNEL_CONFIG_3_POINT_1
 									out_ch_map	$CHANNEL_MAP_3_POINT_1
 								}
-							]
-						}
-					"1"	{
-						# 32-bit 48KHz 2ch
-						Object.Base.input_audio_format [
-							{
-								in_bit_depth            32
-								in_valid_bit_depth      $SDW_LINK_VALID_BITS
-								in_sample_type		$SAMPLE_TYPE_MSB_INTEGER
-								in_fmt_cfg		"$[($in_channels | ($in_valid_bit_depth * 256))]"
-							}
-						]
-						Object.Base.output_audio_format [
-							{
-								out_bit_depth            32
-								out_valid_bit_depth      32
 							}
-						]
-					}
-					}
+						}
+					]
 				}
 			]
 			pipeline [