ASoC: SMA1303: set sma_i2c_regmap storage-class-specifier to static

smatch reports
sound/soc/codecs/sma1303.c:1594:28:
  warning: symbol 'sma_i2c_regmap' was not declared. Should it be static?

sma_i2c_regmap is only used in sma1303, so it should be static
Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20230309140959.2616497-1-trix@redhat.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/sma1303.c

@@ -1591,7 +1591,7 @@ static const struct snd_soc_component_driver sma1303_component = {
 	.num_dapm_routes = ARRAY_SIZE(sma1303_audio_map),
 };
 
-const struct regmap_config sma_i2c_regmap = {
+static const struct regmap_config sma_i2c_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,