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.com


Signed-off-by: Mark Brown <broonie@kernel.org>