i2c: cros-ec-tunnel: Mark ACPI and OF related data as maybe unused

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

  drivers/i2c/busses/i2c-cros-ec-tunnel.c:295:34: error: ‘cros_ec_i2c_of_match’ defined but not used [-Werror=unused-const-variable=]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-cros-ec-tunnel.c

@@ -292,13 +292,13 @@ static int ec_i2c_remove(struct platform_device *dev)
 	return 0;
 }
 
-static const struct of_device_id cros_ec_i2c_of_match[] = {
+static const struct of_device_id cros_ec_i2c_of_match[] __maybe_unused = {
 	{ .compatible = "google,cros-ec-i2c-tunnel" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, cros_ec_i2c_of_match);
 
-static const struct acpi_device_id cros_ec_i2c_tunnel_acpi_id[] = {
+static const struct acpi_device_id cros_ec_i2c_tunnel_acpi_id[] __maybe_unused = {
 	{ "GOOG0012", 0 },
 	{ }
 };