ASoC: adau1701: Replace legacy gpio interface for gpiod

Considering the current transition of the GPIO subsystem, remove all
dependencies of the legacy GPIO interface (linux/gpio.h and linux
/of_gpio.h) and replace it with the descriptor-based GPIO approach.

Signed-off-by: Maíra Canal <maira.canal@usp.br>
Link: https://lore.kernel.org/r/YXWo/9o7ye9a11aR@fedora
Signed-off-by: Mark Brown <broonie@kernel.org>