MIPS: Alchemy: more base address cleanup

remove all redundant peripheral base address defines, fix
all affected boards and drivers.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
To: Linux-MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/2700/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>