From: Tom Rini <trini@kernel.crashing.org>

PPC32: Minor cleanups to IBM4xx and MPC82xx headers.

- Make sure that if <asm/ibm4xx.h> is included on !40x && !440, there is no real effect.
- Delete arch/ppc/platforms/mpc82xx.h
- Make sure that if CONFIG_8260 isn't set, there is no effect in <asm/mpc8260.h>.
- Add a __ASSEMBLY__ test around the extern for __res in <asm/mpc8260.h>.