soundwire: stream: fix disable sequence

When we disable the stream and then call hw_free, two bank switches
will be handled and as a result we re-enable the stream on hw_free.

Make sure the stream is disabled on both banks.

TODO: we need to completely revisit all this and make sure we have a
mirroring mechanism between current and alternate banks.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20190806005522.22642-9-pierre-louis.bossart@linux.intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>