thermal: core: Remove dead code from two functions

Since thermal_register_governor() is only called by
thermal_register_governors() which runs before clearing
thermal_class_unavailable, thermal_tz_list is guaranteed to be
empty when it runs, so the code walking that list in it is
effectively dead.

The same observation applies to the code walking thermal_tz_list
in thermal_unregister_governor() which is also called only if
thermal_class_unavailable hasn't been cleared.

Remove the dead code from both functions mentioned above and rearrange
thermal_register_governor() to reduce indentation level.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/3950489.kQq0lBPeGt@rafael.j.wysocki

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