coresight: tmc: fix spinlock bad magic/usb_qdss_close

Modify the sequence of ETR disable，drvdata->mode is set to
CS_MODE_DISABLE before calling usb_qdss_close().

Change-Id: I575867cee95f4db5ba155a2619ab1eca954d6387
Signed-off-by: Yuanfang Zhang <zhangyuanfang@codeaurora.org>