UPSTREAM: coresight: platform: Fix refcounting for graph nodes

The coresight driver doesn't drop the references on the
remote endpoint/port nodes. Add the missing of_node_put()
calls.

Reported-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(Upstream commit a0f9992c809fb73a05de1894734418a88178539f).

Bug: 140266694
Change-Id: I40343d76a90d9e6e86f65c27a6b7ff7b44b24e33
Signed-off-by: Yabin Cui <yabinc@google.com>