coresight: add qmi_svc_event_notifier_unregister in remote_etm_remove

Needing call qmi_svc_event_notifier_unregister in remote_etm_remove
for releasing some register resource when quit the driver.

Change-Id: Ic6ec2ac1120d8a3d0bfc9c915fa5ac98ee97d212
Signed-off-by: Shaoqing Liu <shaoqingliu@codeaurora.org>