ARM: mvebu: Simplify headers and make local

kirkwood is very nearly fully DT. Remove most of the address
definitions from the header files and make it a local header file.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>