HS Telemetry reporting per-core CPU utilization on SMP

[skliper]

Idle task needs to be updated for SMP so that utilization can be determined for each core.

Imported from GSFCCFS-726

[jphickey]

The SMP situation is improved after PR #90, the idle task is gone and the functionality is now in the PSP.

While whe interface to PSP supports obtaining per-core utilization information, the HS TLM only reports a single aggregate value. To really resolve this would require making this single TLM member to be an array so each core utilization could be reported properly.

[jphickey]

If a customer/stakeholder wants this the remaining work item now is only to implement the TLM change so each core utilization can be reported. The information is available via the internal PSP interface, it just needs to be published in TLM somehow.