sound fixes for 4.0-rc2

Most of changes in this pull request are about the fixes of crash of
FireWire drivers at hot-unplugging.  In addition, there are a few
HD-audio fixes (removal of wrong static, a pin quirk for an ASUS mobo,
a regression fix for runtime PM on Panther Point) and a long-standing
(but fairly minor) bug of PCM core.
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