P10 core special wake-up handling with sbefifo back-end

[ojayanth]

Existing pdbg included core special wake-up handling as part of core probe/release function. This is required only for Kernel back-end.
sbefifo back-end required special wake-up assert /deassert in the core scom path all the remaining core hw operation SBE internally manages special wake-up handling.

Discussed with @amitay and planing to restructure core probe function to meet the special wake-up handling with SBE requirements.