regulator: mt6380: Fix unused array warning

With the following configuration options:
CONFIG_OF is not set
CONFIG_REGULATOR_MT6380=y
we get the following build warning:

  CC      drivers/regulator/mt6380-regulator.o
drivers/regulator/mt6380-regulator.c:322:34: warning: ‘mt6380_of_match’ defined but not used [-Wunused-const-variable=]

Fix this by annotating that array with __maybe_unused, as done in
various regulator drivers.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/all/202207240252.ZY5hSCNB-lkp@intel.com/
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Chenglin Xu <chenglin.xu@mediatek.com>
Link: https://lore.kernel.org/r/20220727132637.76d6073f@endymion.delvareSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/mt6380-regulator.c

@@ -319,7 +319,7 @@ static const struct platform_device_id mt6380_platform_ids[] = {
 };
 MODULE_DEVICE_TABLE(platform, mt6380_platform_ids);
 
-static const struct of_device_id mt6380_of_match[] = {
+static const struct of_device_id  __maybe_unused mt6380_of_match[] = {
 	{ .compatible = "mediatek,mt6380-regulator", },
 	{ /* sentinel */ },
 };