regulator: max20086: Mark OF related data as maybe unused

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

  drivers/regulator/max20086-regulator.c:289:34: error: ‘max20086_dt_ids’ defined but not used [-Werror=unused-const-variable=]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20230310214553.275450-2-krzysztof.kozlowski@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/max20086-regulator.c

@@ -286,7 +286,7 @@ static const struct i2c_device_id max20086_i2c_id[] = {
 
 MODULE_DEVICE_TABLE(i2c, max20086_i2c_id);
 
-static const struct of_device_id max20086_dt_ids[] = {
+static const struct of_device_id max20086_dt_ids[] __maybe_unused = {
 	{
 		.compatible = "maxim,max20086",
 		.data = &(const struct max20086_chip_info) {