ALSA: hda: Cirrus: Fix coefficient index for beep configuration

commit 5a83b4b5a391f07141b157ac9daa51c409e71ab5 upstream.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>