powerpc/64s: consolidate MCE counter increment.

The code in machine_check_exception excludes 64s hvmode when
incrementing the MCE counter only to call opal_machine_check to
increment it specifically for this case.

Remove the exclusion and special case.

Fixes: a43c1590 ("powerpc/pseries: Flush SLB contents on SLB MCE
		errors.")
Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/kernel/traps.c

@@ -741,8 +741,6 @@ void machine_check_exception(struct pt_regs *regs)
 	if (!nested)
 		nmi_enter();
 
-	/* 64s accounts the mce in machine_check_early when in HVMODE */
-	if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64) || !cpu_has_feature(CPU_FTR_HVMODE))
 	__this_cpu_inc(irq_stat.mce_exceptions);
 
 	add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);

arch/powerpc/platforms/powernv/opal.c

@@ -578,8 +578,6 @@ int opal_machine_check(struct pt_regs *regs)
 {
 	struct machine_check_event evt;
 
-	__this_cpu_inc(irq_stat.mce_exceptions);
-
 	if (!get_mce_event(&evt, MCE_EVENT_RELEASE))
 		return 0;