sound fixes for 4.6-rc6

Usually we get a big collection of fixes for ASoC once during rc.
And this is it.

At this time, most of fixes are about Intel Skylake ASoC driver, which
is a new and still on-going development.  Along with it, a slight
large LOC is seen in legacy HD-audio driver, but it's merely a code
move to the upper layer.

Other than that, the rest are small or trivial fixes to various
drivers, in addition to an ASoC dapm debugfs code fix.
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