ASoC: odrodix2_max98090: Make non exported symbols static

odroidx2_drvdata and odroidu3_drvdata are not used outside this module so make
them static (and also const while we are at it).

Fixes the following warnings from sparse:
    sound/soc/samsung/odroidx2_max98090.c:69:26: warning: symbol
     'odroidx2_drvdata' was not declared. Should it be static?
    sound/soc/samsung/odroidx2_max98090.c:74:26: warning: symbol
     'odroidu3_drvdata' was not declared. Should it be static?
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/samsung/odroidx2_max98090.c

@@ -66,12 +66,12 @@ static struct snd_soc_card odroidx2 = {
 	.late_probe		= odroidx2_late_probe,
 };
 
-struct odroidx2_drv_data odroidx2_drvdata = {
+static const struct odroidx2_drv_data odroidx2_drvdata = {
 	.dapm_widgets		= odroidx2_dapm_widgets,
 	.num_dapm_widgets	= ARRAY_SIZE(odroidx2_dapm_widgets),
 };
 
-struct odroidx2_drv_data odroidu3_drvdata = {
+static const struct odroidx2_drv_data odroidu3_drvdata = {
 	.dapm_widgets		= odroidu3_dapm_widgets,
 	.num_dapm_widgets	= ARRAY_SIZE(odroidu3_dapm_widgets),
 };