ASoC: rockchip: Convert RK3288 HDMI to GPIO descriptors

ASoC: rockchip: Convert RK3288 HDMI to GPIO descriptors

This converts the Rockchip RK3288 HDMI driver to use GPIO
descriptors:

- Look up the HP EN GPIO as an optional descriptor and handle
  it directly, the gpiod API is NULL-tolerant so no special
  guards are needed.

- Let the Jack detection core obtain and handle the HP detection
  GPIO, just pass the right name and gpiod_dev and it will
  do the job. Make sure to check that the GPIO property
  is there first, so it becomes optional.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20230929-descriptors-asoc-rockchip-v2-1-2d2c0e043aab@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>