[MTL] x86: Fix Cache info sysfs is not populated

[SRU Justification]

[Impact]

The interface /sys/devices/system/cpu/cpuX/cache is broken (not populated) if
CPUs have different numbers of subleaves in CPUID 4. This is the case of Intel
Meteor Lake.

[Fix]

https://<email address hidden>/
Reviewed, but probably will only land in v6.9.

[Test Case]

Check existence of cpu cache info:

  $ ls /sys/devices/system/cpu/cpu0/cache/
  index0 index1 index2 index3 uevent

[Where problems could occur]

This populates sysfs entries that should have been available, not
something new or alters existing interface.

[Other Info]

While this is targets v6.8 for Intel LPMD (Low Power Model Daemon)'s
use, only Noble and Unstable will be nominated for fix.

========== original bug report ==========

[Description]
  The interface /sys/devices/system/cpu/cpu*/cache is empty. In Meteorlake, not all CPUs have the same number of subleaves in the CPUID 4 leaf. The compute die CPUs have 3 subleaves whereas the CPUs in the SoC die have 2. This problem happens because Linux assumes that all CPUs have the same number of subleaves.

[Hardware Information]
  Architecture:
    Intel / AMD (x86_64)
  Platform(s):
    Meteor Lake
  Date HW is expected at Canonical:

  Component(s):
    x86

[Software Information]
  Target Version:
    24.04
  Target Kernel:
    6.8
  Commit IDs:
    TBD
  External Links:
    https://<email address hidden>/

[Business Justification]

[Testing guidance]

[External ID]
  LFE-6901