ASoC: SOF: tokens: add token for Mediatek AFE

Add the definition for Mediatek audio front end(AFE) tokens,include
AFE sampling rate, channels, and format.
Signed-off-by: YC Hung <yc.hung@mediatek.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Link: https://lore.kernel.org/r/20211118100749.54628-3-daniel.baluta@oss.nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/uapi/sound/sof/tokens.h

@@ -140,4 +140,9 @@
 #define SOF_TKN_INTEL_HDA_RATE			1500
 #define SOF_TKN_INTEL_HDA_CH			1501
 
+/* AFE */
+#define SOF_TKN_MEDIATEK_AFE_RATE		1600
+#define SOF_TKN_MEDIATEK_AFE_CH			1601
+#define SOF_TKN_MEDIATEK_AFE_FORMAT		1602
+
 #endif