[ALSA] adding __devinitdata to pci_device_id

Refering to <kernelsource>/Documentation/pci.txt
the struct pci_device_id can be released after loading the module.

Signed-off-by: Kenrik Kretzschmar <henne@nachtwindheim.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>