coresight: fix comment in of_coresight.c

Outports is a member of the struct pdata and should be
a better choice.

Signed-off-by: Kaixu Xia <xiakaixu@huawei.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit f7c55298f17f0bf9d257ea7f2f15cf920248db5b)
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>