pmccontrol: drop Pentium 4 special case

This is dead code; we no longer support Pentium hardware in libpmc or
hwpmc.

MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation

usr.sbin/pmccontrol/pmccontrol.c

@@ -241,11 +241,6 @@ pmcc_do_list_state(void)
 	ncpu = pc->pm_ncpu;
 
 	for (c = cpu = 0; cpu < ncpu; cpu++) {
-#if	defined(__i386__) || defined(__amd64__)
-		if (pc->pm_cputype == PMC_CPU_INTEL_PIV &&
-		    CPU_ISSET(cpu, &logical_cpus_mask))
-			continue; /* skip P4-style 'logical' cpus */
-#endif
 		if (pmc_pmcinfo(cpu, &pi) < 0) {
 			if (errno == ENXIO)
 				continue;