soundwire: stream: rename and move master/slave_rt_free routines

soundwire: stream: rename and move master/slave_rt_free routines

The naming is rather inconsistent, use the sdw_<object>_<action>
convention, and move the free routine after alloc/config.

No functionality change beyond rename/move.

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/20220126011715.28204-15-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>