ASoC: samsung: h1940: turn into platform driver

Avoid machine specific headers by using a gpio lookup table
combined with a platform_driver for this board.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200806182059.2431-24-krzk@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>