coresight: fix spelling mistake "deffered" -> "deferred"

There is a spelling mistake in the dev_info error message, fix it.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>