[IA64] Fix perfmon sysctl directory modes

New sanity checks in sysctl_check_table() complain about a couple
of mode 0755 that should be 0555 in the perfmon code:

sysctl table check failed: /kernel .1 Writable sysctl directory
sysctl table check failed: /kernel/perfmon  Writable sysctl directory
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/perfmon.c

@@ -558,7 +558,7 @@ static ctl_table pfm_sysctl_dir[] = {
 	{
 		.ctl_name	= CTL_UNNUMBERED,
 		.procname	= "perfmon",
-		.mode		= 0755,
+		.mode		= 0555,
 		.child		= pfm_ctl_table,
 	},
  	{}
@@ -567,7 +567,7 @@ static ctl_table pfm_sysctl_root[] = {
 	{
 		.ctl_name	= CTL_KERN,
 		.procname	= "kernel",
-		.mode		= 0755,
+		.mode		= 0555,
 		.child		= pfm_sysctl_dir,
 	},
  	{}