coresight: tmc-etf: fix etf disable issue

Modify the parameter transferred to coresight_disclaim_device() from
"drvdata" to "drvdata->base".

Change-Id: I0bc3f36fcc23326f2db7ed43af477a0fa4e3c295
Signed-off-by: Yuanfang Zhang <zhangyuanfang@codeaurora.org>