ARM: sun5i: r8: Merge common controllers into the common DTSI

Some controllers found in the R8 DTSI actually apply to all of the sun5i
family. Move those into the common DTSI so that all SoCs can benefit from
it.

Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>