soundwire: stream: add alloc/config/free helpers for ports

soundwire: stream: add alloc/config/free helpers for ports

The existing code only has a config helper that allocates memory,
start adding alloc/config/free for ports, as a first step in the
simplification of the stream API.

This change removes a kfree() on a configuration error, this should
have not impact on existing platforms and error handling will be
revisited in follow-up patches to make sure invalid configurations
have not impact on memory allocation.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20220126011715.28204-5-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>