CVE-2026-98263: ASoC: codecs: rt712-sdca-dmic: fix uninitialized stream_config->type
In the Linux kernel, the following vulnerability has been resolved:
ASoC: codecs: rt712-sdca-dmic: fix uninitialized streamconfig->type
streamconfig is not initialized before being passed to sdwstreamaddslave(). The type field may contain garbage and is later copied to stream->type by sdwconfigstream().
Zero-initialize streamconfig so type defaults to SDWSTREAMPCM.
While at it, use sndsdwparamstoconfig() helper instead of open-coding the same logic.