CONFIG_PPC47x doesn't exist in Kconfig and no 476 processor calls this
function ppc44x_pin_tlb() as it has it's own ppc47x_pin_tlb().

This code is probably an artifact of the original 476 code that
shouldn't have made it upstream.
Signed-off-by: NChristoph Egger <siccegge@cs.fau.de>
Signed-off-by: NTony Breeds <tony@bakeyournoodle.com>
Signed-off-by: NJosh Boyer <jwboyer@gmail.com>