x86/platform/hyperv: Handle VMBUS driver being a module

Hyper-V VMBUS driver can be a module; handle this case
correctly. Please apply.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Cc: olaf@aepfle.de
Cc: apw@canonical.com
Cc: jasowang@redhat.com
Link: http://lkml.kernel.org/r/1396421502-23222-1-git-send-email-kys@microsoft.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/irq.c

@@ -125,7 +125,7 @@ int arch_show_interrupts(struct seq_file *p, int prec)
 		seq_printf(p, "%10u ", per_cpu(mce_poll_count, j));
 	seq_printf(p, "  Machine check polls\n");
 #endif
-#if defined(CONFIG_HYPERV) || defined(CONFIG_XEN)
+#if IS_ENABLED(CONFIG_HYPERV) || defined(CONFIG_XEN)
 	seq_printf(p, "%*s: ", prec, "THR");
 	for_each_online_cpu(j)
 		seq_printf(p, "%10u ", irq_stats(j)->irq_hv_callback_count);