dt-bindings: clk: Add compatibles for D1 CCUs

The D1 has a CCU and a R_CCU (PRCM CCU) like most other sunxi SoCs, with
3 and 4 clock inputs, respectively. Add the compatibles and bindings.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20211119043545.4010-2-samuel@sholland.org