sound fixes for 4.19-rc5

here comes a collection of various fixes, mostly for stable-tree
or regression fixes.

Two relatively high LOCs are about the (rather simple) conversion of
uapi integer types in topology API, and a regression fix about HDMI
hotplug notification on AMD HD-audio.  The rest are all small
individual fixes like ASoC Intel Skylake race condition, minor
uninitialized page leak in emu10k1 ioctl, Firewire audio error paths,
and so on.
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