UPSTREAM: coresight: Communicate perf event to sink buffer allocation functions

Make struct perf_event available to sink buffer allocation functions in
order to use the pid they carry to allocate and free buffer memory along
with regimenting access to what source a sink can collect data for.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Robert Walker <robert.walker@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(Upstream commit a0f08a6a9fee0ce3f2d36e3e30799e4c1ec171f4).

Bug: 140266694
Change-Id: I3f1f16ebef75ec3aa629c46e3f1dc70f3a5ccb91
Signed-off-by: Yabin Cui <yabinc@google.com>