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This patch ensures that workarounds for:

1. Erratas #806969 & #813420 that affect Cortex-A57 r0p0 as described in the
   errata notice document

2. Defect id 831273 which affects the Juno platform by triggering the event
   stream every 65536 cycles

are implemented after every reset on each cpu.

Change-Id: I729f608796536704aa956b715bbad428cc854d34