ASoC: Intel: board_helpers: change dai link helpers to static function

ASoC: Intel: board_helpers: change dai link helpers to static function

Since there is a helper function to generate entire DAI link array, we
switch individual dai link helpers to static function. No functional
change in this commit.

Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Brent Lu <brent.lu@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://msgid.link/r/20240325221059.206042-4-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>