ASoC: da7219: Drop no-op remove function

A remove callback that just returns 0 is equivalent to no callback at all
as can be seen in i2c_device_remove(). So simplify accordingly.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20220603140513.131142-3-u.kleine-koenig@pengutronix.de


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