coresight: etm3x: indentation fix (extra space removed)

An extra space is removed.
Signed-off-by: NMuhammad Abdul Wahab <muhammadabdul.wahab@centralesupelec.fr>
Signed-off-by: NMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>