ARM: dts: sunxi: rename tcon's clock output

ARM: dts: sunxi: rename tcon's clock output

While the rate of TCON0's DCLK matches dotclock for parallel and LVDS
outputs, this doesn't hold for DSI. According manuals from Allwinner,
DCLK is an abbreviation of Data Clock, not dotclock, so go with that
instead.

Signed-off-by: Roman Beranek <me@crly.cz>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Acked-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20230505052110.67514-3-me@crly.cz
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>