drivers: cpuidle: lpm-levels: Support for different CPUs in a cluster

The newer FCM microarchitecture allows for CPUs with different
performance and power characteristics to be part of the same cluster.
The CPUs have different power performances, like latency and residency
for different low power mode.

Adding support to differentiate between CPUs within a single cluster.

Change-Id: I61fbe6d1b9e6963b5db269a079254be82a7b9d3c
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>