[ALSA] intel8x0 - Fix Oops in crash kernel

When intel8x0 driver is loaded in the crash kernel, it gets Oops
occasionally.  This is because the irq handler gets called before
the proper hardware initialization.  Now defer it after
snd_intel8x0_chip_init().
(reference: http://lkml.org/lkml/2007/3/5/252

)

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>