CONFIG_8xx doesn't mean much outside of arch/powerpc/
This patch renames it CONFIG_MPC8xx just like CONFIG_MPC85xx etc ...
It also renames 8xx_immap.h to immap_8xx.h to be consistent with
other file names.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
(cherry picked from commit ee1e600c13d16febd517ab7d0d2c243db174789b)
Change-Id: I564708bb6517b699749e8a54c013d032f785e459
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>