ASoC: SOF: Intel: Use codec_info_list.is_amp directly

ASoC: SOF: Intel: Use codec_info_list.is_amp directly

Now we set is_amp to all amp type codecs. We can use the flag directly
instead of using a local flag to check if the codec is an AMP type.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20260605101805.121428-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>