perf/smmuv3: Fix unused variable warning when CONFIG_OF=n

The kbuild robot reports that building the SMMUv3 PMU driver with
CONFIG_OF=n results in a warning for W=1 builds:

>> drivers/perf/arm_smmuv3_pmu.c:889:34: warning: unused variable 'smmu_pmu_of_match' [-Wunused-const-variable]
   static const struct of_device_id smmu_pmu_of_match[] = {
                                    ^

Guard the match table with #ifdef CONFIG_OF.

Link: https://lore.kernel.org/r/202201041700.01KZEzhb-lkp@intel.com
Fixes: 3f7be435 ("perf/smmuv3: Add devicetree support")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Will Deacon <will@kernel.org>

drivers/perf/arm_smmuv3_pmu.c

@@ -939,11 +939,13 @@ static void smmu_pmu_shutdown(struct platform_device *pdev)
 	smmu_pmu_disable(&smmu_pmu->pmu);
 }
 
+#ifdef CONFIG_OF
 static const struct of_device_id smmu_pmu_of_match[] = {
 	{ .compatible = "arm,smmu-v3-pmcg" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, smmu_pmu_of_match);
+#endif
 
 static struct platform_driver smmu_pmu_driver = {
 	.driver = {