ASoC: cs42l56: remove unused variable 'adc_swap_enum'

sound/soc/codecs/cs42l56.c:206:30: warning:
 adc_swap_enum defined but not used [-Wunused-const-variable=]

It is 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/20190815092436.34632-1-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs42l56.c

@@ -199,14 +199,6 @@ static const struct soc_enum beep_bass_enum =
 	SOC_ENUM_SINGLE(CS42L56_BEEP_TONE_CFG, 1,
 			ARRAY_SIZE(beep_bass_text), beep_bass_text);
 
-static const char * const adc_swap_text[] = {
-	"None", "A+B/2", "A-B/2", "Swap"
-};
-
-static const struct soc_enum adc_swap_enum =
-	SOC_ENUM_SINGLE(CS42L56_MISC_ADC_CTL, 3,
-			ARRAY_SIZE(adc_swap_text), adc_swap_text);
-
 static const char * const pgaa_mux_text[] = {
 	"AIN1A", "AIN2A", "AIN3A"};