x86/mwait-idle: add AlderLake support

x86/mwait-idle: add AlderLake support

Similar to SPR, the C1 and C1E states on ADL are mutually exclusive.
Only one of them can be enabled at a time.

But contrast to SPR, which usually has a strong latency requirement
as a Xeon processor, C1E is preferred on ADL for better energy
efficiency.

Add custom C-state tables for ADL with both C1 and C1E, and

 1. Enable the "C1E promotion" bit in MSR_IA32_POWER_CTL and mark C1
    with the CPUIDLE_FLAG_UNUSABLE flag, so C1 is not available by
    default.

 2. Add support for the "preferred_cstates" module parameter, so that
    users can choose to use C1 instead of C1E by booting with
    "intel_idle.preferred_cstates=2".

Separate custom C-state tables are introduced for the ADL mobile and
desktop processors, because of the exit latency differences between
these two variants, especially with respect to PC10.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
[ rjw: Changelog edits, code rearrangement ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Origin: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git d1cf8bbfed1e
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Release-acked-by: Henry Wang <Henry.Wang@arm.com>