ASoC: amd: ps: use static function

Sparse warning:

error: symbol 'acp63_fill_platform_dev_info' was not declared. Should
it be static?

Also reduce line lines below 100 characters.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20230104145708.25051-1-pierre-louis.bossart@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>