cpufreq: t194: set req. to Fmin when CPU offline

Since offline CPU should not join cluster frequency
judgement, set cpufreq request to Fmin during cpu_down
to let cluster frequency judgement logic won't take
offline CPUs into account.

During cpu_up the cpufreq request value need to restored
as latest requested level (from cpufreq governor).
Add an per-CPU array 'latest_freq_req' to memorize
latest request level.

Register CPUHP_AP_TEGRA_CPUFREQ cpuhp callback
to do related ndiv operations due to following reasons
- The ndiv of a CPU can only be accessed by the same CPU.
- ndiv restore need to be handled as soon as possible
  since cluster PLL frequency = Fmin during cpu_up() of
  1st core in a cluster until ndiv value restored.

Bug 200610512

Change-Id: I60fe3f3aca58f51357b1e2a10a639427049b8b67
Signed-off-by: Aaron Tian <atian@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2467766
(cherry picked from commit e2cb988601c600d3f5c4fdbe19821bc1392dfbce)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2513653
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

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