ALSA: emu10k1: use high-level I/O in set_filterQ()

This makes the code shorter and more legible.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230423181002.1246793-2-oswald.buddenhagen@gmx.de


Signed-off-by: Takashi Iwai <tiwai@suse.de>