ASoC: nau8822: add speaker Bridge Tied Output configuration

Allow configuring the two loudspeaker outputs as a
single Bridge Tied Load output getting higher output power.

Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://lore.kernel.org/r/20230104140412.35575-4-francesco@dolcini.it


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