USB: qdss: Fix NULL pointer deference issue during QDSS transfers

There is a chance that usb_qdss_close() and disconnect race each other and
it might result in NULL pointer dereference in set_qdss_data_connection()
called from usb_qdss_close(). Fix the issue by passing qdss as argument
to set_qdss_data_connection() instead of ep.

Also remove restart call, which simulates spoof disconnect and connect,
when qdss channel is being closed, which is not required anymore as
DBM endpoints can be claimed without full USB block reset now.

Change-Id: I00642402dbe2e9595d3b3ce760ba4ed2deb2899f
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>
Signed-off-by: Mayank Rana <mrana@codeaurora.org>