ARM64: make of_device_ids const

of_device_ids (i.e. compatible strings and the respective data) are not
supposed to change at runtime. All functions working with of_device_ids
provided by <linux/of.h> work with const of_device_ids. So mark the
only non-const struct in arch/arm64 as const, too.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/kernel/perf_event.c

@@ -1276,7 +1276,7 @@ arch_initcall(cpu_pmu_reset);
 /*
  * PMU platform driver and devicetree bindings.
  */
-static struct of_device_id armpmu_of_device_ids[] = {
+static const struct of_device_id armpmu_of_device_ids[] = {
 	{.compatible = "arm,armv8-pmuv3"},
 	{},
 };