No 64-bit PPC_MULTIPLATFORM platforms use the mv643xx_eth driver,
so build it only on PPC32.
Signed-off-by: NDale Farnsworth <dale@farnsworth.org>
Acked-by: NSven Luther <sl@bplan-gmbh.de>
Signed-off-by: NJeff Garzik <jeff@garzik.org>