VAAPI: Change some loglevels - we are spamming too much

By default we log a whole lot of things on NOTICE level, but whenever a problem arrises we ask the user for a debuglog anyways. So this PR moves debug information (e.g. starting of threads and so on) to LOGDEBUG.

Perhaps we should also adapt to the component logging - to not spam other devs when they debug something non VAAPI related.
since people are complaining so much about libCEC logging (with debugging enabled): why do we need this as notice? surely thread creating and context creating is something that you only need for debugging?