[BUG] Revert 0b05e2d671c4 'powerpc/32: cacheable_memcpy becomes memcpy'

[Thomas Gleixner]

With this commit applied, my MPC5200 board fails to boot 4.3-rc1. The
boot failure is silent.

Bisection pointed straight to this commit. Reverting it on top of
4.3-rc1 works like a charm.

Thanks,

	tglx