ARM i.MX53: tve_di clock is not part of the CCM, but of TVE

Remove the tve_di clock from the CCM clock tree. It will be provided
by the Television Encoder driver, as this clock is an output signal
of the TVE module.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>