cpufreq: tegra20: Remove unneeded check in tegra_cpu_init

Remove checking of the CPU number for consistency as it won't ever fail
unless there is a severe bug in the cpufreq core.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>