ASoC: max98357a: add compatible string for MAX98360A

Maxim MAX98360A audio amplifier is functionally identical to MAX98357A.
Adds compatible string "maxim,max98360a" for driver reuse.

Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20200605034931.107713-2-tzungbi@google.com


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