power: supply: bq24257: skip 'struct acpi_device_id' when !CONFIG_ACPI

Since ACPI_PTR() is used to NULLify the value when !CONFIG_ACPI, the
struct acpi_device_id becomes unused:

  drivers/power/supply/bq24257_charger.c:1155:36: warning:
    'bq24257_acpi_match' defined but not used [-Wunused-const-variable=]
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/bq24257_charger.c

@@ -1152,6 +1152,7 @@ static const struct of_device_id bq24257_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, bq24257_of_match);
 
+#ifdef CONFIG_ACPI
 static const struct acpi_device_id bq24257_acpi_match[] = {
 	{ "BQ242500", BQ24250 },
 	{ "BQ242510", BQ24251 },
@@ -1159,6 +1160,7 @@ static const struct acpi_device_id bq24257_acpi_match[] = {
 	{},
 };
 MODULE_DEVICE_TABLE(acpi, bq24257_acpi_match);
+#endif
 
 static struct i2c_driver bq24257_driver = {
 	.driver = {