ASoC: SOF: ipc4-topology: Add definition for generic switch/enum control

Currently IPC4 has no notion of a switch or enum type of control which is
a generic concept in ALSA.

The generic support for these control types will be as follows:
- large config is used to send the channel-value par array
- param_id of a SWITCH type is 200
- param_id of an ENUM type is 201

Each module need to support a switch or/and enum must handle these
universal param_ids.
The message payload is described by struct sof_ipc4_control_msg_payload.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20230919103115.30783-2-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/ipc4-topology.h

@@ -319,7 +319,7 @@ struct sof_ipc4_copier {
 /**
  * struct sof_ipc4_ctrl_value_chan: generic channel mapped value data
  * @channel: Channel ID
- * @value: gain value
+ * @value: Value associated with @channel
  */
 struct sof_ipc4_ctrl_value_chan {
 	u32 channel;
@@ -343,6 +343,23 @@ struct sof_ipc4_control_data {
 	};
 };
 
+#define SOF_IPC4_SWITCH_CONTROL_PARAM_ID	200
+#define SOF_IPC4_ENUM_CONTROL_PARAM_ID		201
+
+/**
+ * struct sof_ipc4_control_msg_payload - IPC payload for kcontrol parameters
+ * @id: unique id of the control
+ * @num_elems: Number of elements in the chanv array
+ * @reserved: reserved for future use, must be set to 0
+ * @chanv: channel ID and value array
+ */
+struct sof_ipc4_control_msg_payload {
+	uint16_t id;
+	uint16_t num_elems;
+	uint32_t reserved[4];
+	DECLARE_FLEX_ARRAY(struct sof_ipc4_ctrl_value_chan, chanv);
+} __packed;
+
 /**
  * struct sof_ipc4_gain_data - IPC gain blob
  * @channels: Channels