ACPI: thermal: Fold acpi_thermal_get_info() into its caller

There is only one caller of acpi_thermal_get_info() and the code from
it can be folded into its caller just fine, so do that.

No intentional functional impact.

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