sound fixes for 3.19

Hopefully the final pull request for 3.19: this ended up with a
slightly higher volume than wished, but I put them all as they are
either stable or 3.19 regression fixes.

Most of commits are from ASoC, and have been stewed for a while in
linux-next.  The only change in the common code is the regression
fixes for ASoC AC97 stuff wrt device registrations.  The rest are
device-specific, mostly small fixes in various ASoC drivers and
ak411x on ice1724 boards.
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