ACPI: thermal: Use BIT() macro for defining flags

Use the BIT() macro for defining flag symbols in the ACPI thermal driver
instead of using "raw" values for the flags.

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>