cpupower: Add support for amd-pstate preferred core rankings

The rankings are useful information to determine if the scheduler
is placing tasks appropriately for the hardware.

Link: https://lore.kernel.org/r/20241218191144.3440854-4-superm1@kernel.org


Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>