arm64: dts: apq8016-sbc: add mbhc buttons support

This patch adds voltage thresholds configuration required for getting
audio headsets button support.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi

@@ -379,6 +379,8 @@ &wcd_codec {
         status = "okay";
         clocks = <&gcc GCC_CODEC_DIGCODEC_CLK>;
         clock-names = "mclk";
+	qcom,mbhc-vthreshold-low = <75 150 237 450 500>;
+	qcom,mbhc-vthreshold-high = <75 150 237 450 500>;
 };
 
 &smd_rpm_regulators {