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This patch brings in the following fixes:

  - The per-PE target data initialized during power up needs to be
    flushed so as to be visible to other PEs.

  - Setup per-PE target data for the primary PE as well. At present,
    this was only setup for secondary PEs when they were powered on.

Change-Id: Ibe3a57c14864e37b2326dd7ab321a5c7bf80e8af
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>