We kept some typedefs in uapi/sound/*.h so that the programs in
alsa-tools can be built.  Now that alsa-lib takes these and applies
the workarounds in its own, we don't need these typedefs any longer in
the kernel uapi side.  Let's drop them.

Link: https://lore.kernel.org/r/20191220161555.20232-1-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>