ARM: sun5i: a13: Add display and TCON clocks

Enable the display and TCON (channel 0 and channel 1) clocks that are going
to be needed to drive the display engine, tcon and TV encoders.

Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>