ASoC: cs53l30: Fix non static symbol warnings

Fixes the following sparse warnings:

sound/soc/codecs/cs53l30.c:182:20: warning:
symbol 'input1_sel_values' was not declared. Should it be static?
sound/soc/codecs/cs53l30.c:202:20: warning:
symbol 'input2_sel_values' was not declared. Should it be static?
sound/soc/codecs/cs53l30.c:734:20: warning:
symbol 'cs53l30_src_rates' was not declared. Should it be static?

Signed-off-by: Wei Yongjun <[e-mail]>
Acked-by: Nicolin Chen <[e-mail]>
Acked-by: Paul Handrigan <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/codecs/cs53l30.c

···
 	"DMIC1 Off ADC1 Off",
 };
 
-unsigned int const input1_sel_values[] = {
+static unsigned int const input1_sel_values[] = {
 	CS53L30_CH_TYPE,
 	CS53L30_ADCxB_PDN | CS53L30_CH_TYPE,
 	CS53L30_ADCxA_PDN | CS53L30_CH_TYPE,
···
 	"DMIC2 Off ADC2 Off",
 };
 
-unsigned int const input2_sel_values[] = {
+static unsigned int const input2_sel_values[] = {
 	0x0,
 	CS53L30_ADCxB_PDN,
 	CS53L30_ADCxA_PDN,
···
 				  CS53L30_ASP_3ST_MASK, val);
 }
 
-unsigned int const cs53l30_src_rates[] = {
+static unsigned int const cs53l30_src_rates[] = {
 	8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000
 };