uboot-imx

ppc/85xx: add ld script file for boot from NAND

The first stage 4K image uses a seperate ld script file to
generate 4K image. This patch moves it to the cpu/mpc85xx/*
to make it avaliable for 85xx platform.

Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>