ARM: tegra: Create platform device for tegra20-cpufreq driver

Tegra20-cpufreq driver require a platform device in order to be loaded,
instantiate a simple platform device for the driver during of the machines
late initialization.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/mach-tegra/tegra.c

@@ -97,6 +97,10 @@ static void __init tegra_dt_init_late(void)
 	if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) &&
 	    of_machine_is_compatible("compal,paz00"))
 		tegra_paz00_wifikill_init();
+
+	if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC) &&
+	    of_machine_is_compatible("nvidia,tegra20"))
+		platform_device_register_simple("tegra20-cpufreq", -1, NULL, 0);
 }
 
 static const char * const tegra_dt_board_compat[] = {