jtagv8mm: enable etm save and restore support for 8916
CoreSight ETM registers do not retain their state on power collapse.
This change provides save-restore support for these registers using
memory mapped access to allow tracing across power collapse.
Change-Id: Idc04bb85580f8fe4eee4eeb7b6509d0aaf61b7b1
Signed-off-by:
Aparna Das <adas@codeaurora.org>
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