MPIPL: Reserve memory to capture architected registers data

- Split SPIRAH memory to accommodate architected register ntuple.
  Today we have 1K memory for SPIRAH and it uses 288 bytes. Lets split
  this into two parts :
    SPIRAH (756 bytes)
    architected register memory (256 bytes)

- Update SPIRAH architected register ntuple

- Calculate memory required to capture architected registers data
  Ideally we should use HDAT provided data (proc_dump_area->thread_size).
  But we are not getting this data during boot. Hence lets reserve fixed
  memory for architected registers data collection.

- Add architected registers destination memory to reserve-memory DT node.

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
[oliver: rebased]
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>

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