ALSA: pci: clean up using module_pci_driver()

sound/pci/ad1889.c

sound/pci/ali5451/ali5451.c

sound/pci/als300.c

sound/pci/als4000.c

sound/pci/asihpi/asihpi.c

sound/pci/atiixp.c

sound/pci/atiixp_modem.c

sound/pci/au88x0/au88x0.c

sound/pci/aw2/aw2-alsa.c

sound/pci/azt3328.c

sound/pci/bt87x.c

sound/pci/ca0106/ca0106_main.c

sound/pci/cmipci.c

sound/pci/cs4281.c

sound/pci/cs46xx/cs46xx.c

sound/pci/cs5530.c

sound/pci/cs5535audio/cs5535audio.c

sound/pci/ctxfi/xfi.c

sound/pci/echoaudio/echoaudio.c

sound/pci/emu10k1/emu10k1.c