ALSA: oxygen: Xonar DG(X): cleanup and minor changes

Remove old SPI control functions, change anti-pop init
sequence, remove some garbage from structures. The 'Apply' functions
must be called at the mixer initialization, otherwise
mixer settings sometimes will not be applied at startup.

Signed-off-by: Roman Volkov <v1ron@mail.ru>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

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

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

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