arm/dts: Capri/+: enable aw882xx volume fade

- Add a new property to control aw882xx volume fade,
enable it for avoiding speaker pop noise.

Change-Id: I4c55147426818e1f59a3c08ef2bb70034407ab21
Signed-off-by: guoyf2 <guoyf2@lenovo.com>
Reviewed-on: https://gerrit.mot.com/1784597
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Wen Xie <xiewen3@motorola.com>
Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com>
Submit-Approved: Jira Key

qcom/bengal-capri-awinic-audio-overlay.dtsi

@@ -74,6 +74,7 @@
 		/* irq-gpio = <&tlmm 112 0x2008>; */
 		monitor-flag = <1>;
 		monitor-timer-val = <3000>;
+		fade-flag = <1>;
 
 		afe-rx-portid = <0x1000>;
 		afe-tx-portid = <0x1001>;