ARM: tegra: Constify list of CPU domains

There's no need to modify these at runtime, it is static data and never
needs to change.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/mach-tegra/powergate.c

@@ -42,8 +42,9 @@
 
 static int tegra_num_powerdomains;
 static int tegra_num_cpu_domains;
-static u8 *tegra_cpu_domains;
-static u8 tegra30_cpu_domains[] = {
+static const u8 *tegra_cpu_domains;
+
+static const u8 tegra30_cpu_domains[] = {
 	TEGRA_POWERGATE_CPU0,
 	TEGRA_POWERGATE_CPU1,
 	TEGRA_POWERGATE_CPU2,