ARM: dts: sunxi: Use macros for references to CCU clocks

A few clocks from the CCU were exported later, and references to them in
the device tree were using raw numbers.

Now that the DT binding header changes are in as well, switch to the
macros for more clarity.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>