coresight: cti: Add CPU idle pm notifer to CTI devices

Adds a notify callback for CPU PM events to the CTI driver - for
CPU bound CTI devices.

Signed-off-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200518180242.7916-24-mathieu.poirier@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>