ASoC: dt-bindings: max98396: add amplifier driver

This patch adds dt-bindings information for Analog Devices MAX98396
and MAX98397 Smart Amplifier.

Signed-off-by: Ryan Lee <ryans.lee@analog.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220425173715.1827706-1-ryan.lee.analog@gmail.com


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