UPSTREAM: coresight: perf: Clean up function etm_setup_aux()

There is no point in allocating sink memory for a trace session if
there is not a way to free it once it is no longer needed.  As such make
sure the sink API function to allocate and free memory have been
implemented before moving ahead with the establishment of a trace
session.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
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 02d5c897a091f8e064f022a5383978182751d7fb).

Bug: 140266694
Change-Id: I5d28ade5b9859beb10ddf4f61d1d4698dd960473
Signed-off-by: Yabin Cui <yabinc@google.com>