i2c: xiic: hide OF related data for COMPILE_TEST

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

  drivers/i2c/busses/i2c-xiic.c:1202:39: error: ‘xiic_2_00’ 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-xiic.c

@@ -1199,11 +1199,11 @@ static const struct i2c_adapter xiic_adapter = {
 	.algo = &xiic_algorithm,
 };
 
+#if defined(CONFIG_OF)
 static const struct xiic_version_data xiic_2_00 = {
 	.quirks = DYNAMIC_MODE_READ_BROKEN_BIT,
 };
 
-#if defined(CONFIG_OF)
 static const struct of_device_id xiic_of_match[] = {
 	{ .compatible = "xlnx,xps-iic-2.00.a", .data = &xiic_2_00 },
 	{ .compatible = "xlnx,axi-iic-2.1", },