powercap: intel_rapl: Add support for Bartlett Lake platform

Add Bartlett Lake to the list of supported processors in the RAPL
common driver.

Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Qiao Wei <wei.qiao@intel.com>
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>