KBL is similar to SKL

Signed-off-by: Len Brown <len.brown@intel.com>
[Linux commit: 3ce093d4de753d6c92cc09366e29d0618a62f542]
Signed-off-by: Jan Beulich <jbeulich@suse.com>

--- a/xen/arch/x86/cpu/mwait-idle.c
+++ b/xen/arch/x86/cpu/mwait-idle.c
@@ -825,6 +825,8 @@ static const struct x86_cpu_id intel_idl
 	ICPU(0x56, bdw),
 	ICPU(0x4e, skl),
 	ICPU(0x5e, skl),
+	ICPU(0x8e, skl),
+	ICPU(0x9e, skl),
 	ICPU(0x55, skx),
 	ICPU(0x57, knl),
 	{}