ASoC: fsl_micfil: Add access property for "VAD Detected"

[ Upstream commit c7661bf ]

Add access property SNDRV_CTL_ELEM_ACCESS_READ for control "VAD
Detected", which doesn't support put operation, otherwise there will be
issue with mixer-test.

Fixes: 29dbfee ("ASoC: fsl_micfil: Add Hardware Voice Activity Detector support")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://patch.msgid.link/20260401094226.2900532-2-shengjiu.wang@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: TE-N-ShengjiuWang

sound/soc/fsl/fsl_micfil.c

@@ -424,7 +424,13 @@ static const struct snd_kcontrol_new fsl_micfil_snd_controls[] = {
 	SOC_SINGLE("HWVAD ZCD Adjustment", REG_MICFIL_VAD0_ZCD, 8, 15, 0),
 	SOC_SINGLE("HWVAD ZCD And Behavior Switch",
 		   REG_MICFIL_VAD0_ZCD, 4, 1, 0),
-	SOC_SINGLE_BOOL_EXT("VAD Detected", 0, hwvad_detected, NULL),
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+		.access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+		.name = "VAD Detected",
+		.info = snd_soc_info_bool_ext,
+		.get = hwvad_detected,
+	},
 };
 
 static int fsl_micfil_use_verid(struct device *dev)