ASoC: uniphier: mark OF related data as maybe unused

The driver can be compile tested with !CONFIG_OF making certain data
unused:

  sound/soc/uniphier/aio-ld11.c:375:34: warning: ‘uniphier_aio_of_match’ defined but not used [-Wunused-const-variable=]
  sound/soc/uniphier/evea.c:554:34: warning: ‘evea_of_match’ defined but not used [-Wunused-const-variable=]
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20201125164452.89239-14-krzk@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/uniphier/aio-ld11.c

@@ -372,7 +372,7 @@ static const struct uniphier_aio_chip_spec uniphier_aio_ld20_spec = {
 	.addr_ext  = 1,
 };
 
-static const struct of_device_id uniphier_aio_of_match[] = {
+static const struct of_device_id uniphier_aio_of_match[] __maybe_unused = {
 	{
 		.compatible = "socionext,uniphier-ld11-aio",
 		.data = &uniphier_aio_ld11_spec,

sound/soc/uniphier/aio-pxs2.c

@@ -282,7 +282,7 @@ static const struct uniphier_aio_chip_spec uniphier_aio_pxs2_spec = {
 	.addr_ext  = 0,
 };
 
-static const struct of_device_id uniphier_aio_of_match[] = {
+static const struct of_device_id uniphier_aio_of_match[] __maybe_unused = {
 	{
 		.compatible = "socionext,uniphier-pxs2-aio",
 		.data = &uniphier_aio_pxs2_spec,

sound/soc/uniphier/evea.c

@@ -551,7 +551,7 @@ static int evea_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static const struct of_device_id evea_of_match[] = {
+static const struct of_device_id evea_of_match[] __maybe_unused = {
 	{ .compatible = "socionext,uniphier-evea", },
 	{}
 };