x86/cpu: Add/fix core comments for {Panther,Nova} Lake

The E-core in Panther Lake is Darkmont, not Crestmont.

Nova Lake is built from Coyote Cove (P-core) and Arctic Wolf (E-core).

Fixes: 43bb700c ("x86/cpu: Update Intel Family comments")
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://patch.msgid.link/20251028172948.6721-1-tony.luck@intel.com