uboot-imx

powerpc: change 86xx SMP boot method

We put the bootpg for the secondary cpus into memory and use
BPTR to get to it.  This is a step towards converting to the
ePAPR boot methodology.  Also, the code is written to
deal properly with more than 4GB of RAM.

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>