qcom: msm-pm: Partial goods support for sleep status driver

On certains devices, some of the CPUs within the apps subsystem are not
functional and might be removed from the CPU possible map. To handle this
dynamic list of CPUs, sleep driver shouldn't make any assumptions with
regards to the logical mapping of the CPU.

Remove the assumption on how physical CPUs are mapped onto logical CPUs and
populate create a reference of sleep status driver in the corresponding
CPU phandles. When the sleep status driver is probed, it would probe
iterating the list of possble CPUs.

CRs-fixed: 756327
Change-Id: I3afe8c9afd26000ab08f0e0c2703f2ce9e15f374
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>