powercap: intel_rapl_msr: Add PL4 support for Panther Lake

Add Panther Lake to the list of processors where PL4 is supported.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Link: https://patch.msgid.link/20250625020522.253548-1-rui.zhang@intel.com


Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>