ASoC: Intel: Skylake: Remove skl_tplg_is_multi_fmt()

Rather than forcing userspace to select proper format with enumerable
kcontrols, select it ourselves based on provided hw_params.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Tested-by: Lukasz Majczak <lma@semihlaf.com>
Link: https://lore.kernel.org/r/20221205085330.857665-3-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>