ARM: mvebu: move DT Dove to MVEBU

With all the DT support preparation done, we are able to move Dove
to MVEBU easily. Legacy non-DT mach-dove is left untouched to rot
for a while before removal.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>