sunxi: Split up long Kconfig lines

Currently we have some lines in board/sunxi/Kconfig that are very long.
These line either provide default values for a set of SoCs, or limit
some option to a subset of sunxi SoCs.

Fortunately Kconfig makes it easy to split them. The Kconfig language
document states

    If multiple dependencies are defined, they are connected with '&&'.

This means we can split existing dependencies at "&&" symbols. This
applies to both the "depends on" lines and "if" expressions.

This patch splits them up to one symbol per line. This will make it
easier to add, remove, or modify one item at a time.

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