cpu/intel/model_206ax: Only use supported C-states

When advertising C-state using the ACPI _CST object, make sure
to only advertise those that are supported by the CPU.
Downgrade if it's not and make sure to not advertise duplicate
states.

Add debug prints for the finally selected mapping of ACPI
C-state vs Intel CPU C-state.

Test: Tested on Lenovo X220.
      All C-states are still advertised as all are supported.

Change-Id: Iaaee050e0ce3c29c12e97f5819a29f485a7946c2
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78194
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

0 files changed, 0 insertions, 0 deletions