sound fixes for 3.16-rc2

The significant part here is a few security fixes for ALSA core
control API by Lars.  Besides that, there are a few fixes for ASoC
sigmadsp (again by Lars) for building properly, and small fixes for
ASoC rsnd, MMP, PXA and FSL, in addition to a fix for bogus WARNING in
i915/HD-audio binding.
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