clk: sunxi-ng: add support for the Allwinner A100 CCU

Add support for a100 in the sunxi-ng CCU framework.

Signed-off-by: Yangtao Li <frank@allwinnertech.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1eb41bf6c966a0e54820200650d27a5d4f2ac160.1595572867.git.frank@allwinnertech.com