ASoC: tas2562: Add voltage sense slot property

Add a property to configure the slot for the voltage sense monitoring of
the device. Vsense data will be sent to the processor via the slot
defined by the property
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20200626154143.20351-2-dmurphy@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/tas2562.txt

@@ -11,6 +11,8 @@ Required properties:
  - compatible:	   - Should contain "ti,tas2562", "ti,tas2563".
  - reg:		   - The i2c address. Should be 0x4c, 0x4d, 0x4e or 0x4f.
  - ti,imon-slot-no:- TDM TX current sense time slot.
+ - ti,vmon-slot-no:- TDM TX voltage sense time slot. This slot must always be
+		     greater then ti,imon-slot-no.
 
 Optional properties:
 - interrupt-parent: phandle to the interrupt controller which provides
@@ -30,5 +32,6 @@ tas2562@4c {
 
 	shut-down-gpio = <&gpio1 15 0>;
         ti,imon-slot-no = <0>;
+        ti,vmon-slot-no = <1>;
 };