coresight: get etm funnel port for associated cpu
Add support to retrieve CoreSight ETM funnel port for the CPU
associated with the ETM device to allow enabling and disabling
the correct funnel port to prevent trace flush hang during power
collapse.
Signed-off-by:
Aparna Das <adas@codeaurora.org>
Change-Id: I880881b5d4de4bf1947e5316eb1ad624176516dd
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