sound fixes for 4.9-rc5

this became a largish pull-request, as we've got a bunch of pending
ASoC fixes at this time.  One noticeable change is the removal of
error directive in uapi/sound/asoc.h.  We found that the API has
been already used on Chromebooks, so we need to support it even now.

A slight big LOC is found in Qualcomm lpass driver, but the rest are
all small and easy fixes for ASoC drivers (sti, sun4i, Realtek codecs,
Intel, tas571x, etc) in addition to the patches to harden the ALSA
core proc file accesses.
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