[PATCH Fix for Kingston HyperX Amp (0951:16d8) 0/2 (Try #2)]

[crwulff at gmail.com]

From: Chris Wulff <crwulff at gmail.com>

This patch set is modified to use an inline function for the mixer control
interface lookup. The attempt at preventing modifications to a PCM that has
previously been registered has been changed to defer registration instead,
and has been split into a separate patch. This approach now works with pulseaudio.