intel_idle: enable IVB Xeon support

IVB Xeon currently shares the same parameters IVB client.
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/idle/intel_idle.c

@@ -413,6 +413,7 @@ static const struct x86_cpu_id intel_idle_ids[] = {
 	ICPU(0x2a, idle_cpu_snb),
 	ICPU(0x2d, idle_cpu_snb),
 	ICPU(0x3a, idle_cpu_ivb),
+	ICPU(0x3e, idle_cpu_ivb),
 	{}
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_idle_ids);