[PATCH v2 1/2] x86/cpuidle: drop Cannon Lake support

[Jan Beulich <jbeulich@xxxxxxxx>]

As per SDM rev 071 Cannon Lake has
- no CC3 residency MSR at 3FC,
- a CC1 residency MSR ar 660 (like various Atoms),
- a useless (always zero) CC3 residency MSR at 662.
However, this CPU model has been discontinued and isn't a primary target
of Xen anyway. Hence (at least for now) rather than correcting things,
simply drop the case label altogether.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v2: Split from larger patch.

--- a/xen/arch/x86/acpi/cpu_idle.c
+++ b/xen/arch/x86/acpi/cpu_idle.c
@@ -180,8 +180,6 @@ static void do_get_hw_residencies(void *
     case 0x4E:
     case 0x55:
     case 0x5E:
-    /* Cannon Lake */
-    case 0x66:
     /* Kaby Lake */
     case 0x8E:
     case 0x9E: