When building a ppc32 MULTIPLATFORM kernel for a 64bit pmac, we try and
build certain files or use certain functions that make no sense in that
context.  This catches the last of these.
Signed-off-by: NTom Rini <trini@kernel.crashing.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>