ASoC: cs42l73: remove unused variables 'vsp_output_mux' and 'xsp_output_mux'

ASoC: cs42l73: remove unused variables 'vsp_output_mux' and 'xsp_output_mux'

sound/soc/codecs/cs42l73.c:276:38: warning:
 vsp_output_mux defined but not used [-Wunused-const-variable=]
sound/soc/codecs/cs42l73.c:279:38: warning:
 xsp_output_mux defined but not used [-Wunused-const-variable=]

They are never used, so can be removed.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20190815085454.30384-1-yuehaibing@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>