ppc4xx: Cleanup CPCI405 board code

This patch cleans up CPCI405 board support:
- wrap long lines
- unification of spaces in function calls
- remove dead code

Use correct io accessors on peripherals.

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
Signed-off-by: Stefan Roese <sr@denx.de>