ALSA: oxygen: use a copy of the model struct

Put a copy of the model structure into the chip structure so that model-
specific drivers can modify it depending on a particular device
instance.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

diff --cc sound/pci/oxygen/oxygen.h
Simple merge

diff --cc sound/pci/oxygen/oxygen_lib.c
Simple merge

diff --cc sound/pci/oxygen/oxygen_mixer.c
Simple merge

diff --cc sound/pci/oxygen/oxygen_pcm.c
Simple merge