powercap: intel_rapl: Add support for RAPTORLAKE_P

Add RAPTORLAKE_P to the list of supported processor models in the Intel
RAPL power capping driver.

Signed-off-by: George D Sworo <george.d.sworo@intel.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com>
[ rjw: Minor changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>