ACPI / thermal: Remove unused macros in the driver/acpi/thermal.c

The ACPI_THERMAL_FILE* macros are not used now, so remove them.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>