coresight: remove the unused macro CORESIGHT_DEBUGFS_ENTRY

Debugfs isn't used for coresight configuration, so the macro
CORESIGHT_DEBUGFS_ENTRY is unnecessary, just remove it.

Signed-off-by: Xia Kaixu <xiakaixu@huawei.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>