int340X/processor_thermal_device: add support for MMIO RAPL

Introduce MMIO RAPL support as Intel processor_thermal device exposes the
capability to do RAPL control via MMIO registers.

Reviewed-by: Pandruvada, Srinivas <srinivas.pandruvada@intel.com>
Tested-by: Pandruvada, Srinivas <srinivas.pandruvada@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>