perf/x86/intel, x86/cpu: Replace Pentium 4 model checks with VFM ones

Introduce a name for an old Pentium 4 model and replace the x86_model
checks with VFM ones. This gets rid of one of the last remaining
Intel-specific x86_model checks.

Signed-off-by: Sohil Mehta <sohil.mehta@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250318223828.2945651-3-sohil.mehta@intel.com