ALSA: spitz: MONO -> MONO1

Correct route name to be MONO1 instead of MONO to follow
recent fix in wm8750.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>