modem/q6voiced: upgrade to 0_git20210408 (fix bad regression) (MR 2103)
When I upgraded tinyalsa to the new 2.0.0 major release (with breaking changes) I failed to test q6voiced properly, even though I explicitly had to rebuild it against the new tinyalsa version (see MR 1941). In tinyalsa 2.0.0, calling pcm_open() does not automatically call pcm_prepare() anymore, which is responsible for actually starting any audio streams. This means that the old version of q6voiced is almost entirely broken - only by pure luck it's sometimes possible to get voice call audio working if you play other audio simultaenously while a voice call is active. This does not work for the microphone though. The new q6voiced version now calls pcm_prepare() explicitly to fix this.