powercap: intel_rapl: add support for ALDERLAKE_N

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

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