ASoC: Intel: pass correct parameter in sst_alloc_stream_mrfld()

"data" is always NULL in this function.  I think we should be passing
"&data" to sst_prepare_and_post_msg() instead of "data".

Fixes: 3d9ff346 ('ASoC: Intel: sst: add stream operations')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Tested-by: Dinesh Mirche <dinesh.mirche@intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>