ASoC: wm_adsp: Add speaker Tx as a firmware option

#define ADSP2_RAM_RDY_SHIFT                    0

#define ADSP2_RAM_RDY_WIDTH                    1

#define WM_ADSP_NUM_FW 3

#define WM_ADSP_NUM_FW 4

static const char *wm_adsp_fw_text[WM_ADSP_NUM_FW] = {

	"MBC/VSS", "Tx", "Rx ANC"

	"MBC/VSS", "Tx", "Tx Speaker", "Rx ANC"

};

static struct {

} wm_adsp_fw[WM_ADSP_NUM_FW] = {

	{ .file = "mbc-vss" },

	{ .file = "tx" },

	{ .file = "tx-spk" },

	{ .file = "rx-anc" },

};