clk: sunxi-ng: sun8i-de2: Add R40 specific quirks

R40 is actually very similar to A64, but it doesn't have mixer1 reset.
This means it's clocks and resets combination is unique and R40 specific
quirks are needed.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>