ASoC: rt5677: Move platform code to board file

GPIO ACPI mapping table is defined on platform basis. Codec driver
shouldn't have known what platform is using it.

Make codec driver more generic by moving platform code to where it
belongs.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>