ASoC: SOF: Intel: add hyphen between name and index to amp name_prefix

ASoC: SOF: Intel: add hyphen between name and index to amp name_prefix

For those amps that use their name as name prefix the amp id should be
added after a hyphen symbol. Like "rt1320-1".

Fixes: 5226d19d4cae ("ASoC: SOF: Intel: use sof_sdw as default SDW machine driver")
Signed-off-by: Shuming Fan <shumingf@realtek.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://patch.msgid.link/20251021065700.130810-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>