ASoC: SOF: Intel: use def_tristate, avoid using select

ASoC: SOF: Intel: use def_tristate, avoid using select

So far we used select to use the relevant built-in/module options, but
this led to blurring layers between core and Intel Kconfigs.

Use def_tristate works just as well and removes Intel stuff from the code.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191101173045.27099-7-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>