ACPI: thermal: Move symbol definitions to one place

Move all of the symbol definitions to the initial part of the code so
they all can be found in one place.

While at it, consolidate white space used in there.

No functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Michal Wilczynski <michal.wilczynski@intel.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>