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>
diff --git a/cpu/mpc86xx/Makefile b/cpu/mpc86xx/Makefile
index a9767ad..34a9755 100644
--- a/cpu/mpc86xx/Makefile
+++ b/cpu/mpc86xx/Makefile
@@ -31,6 +31,10 @@
 START	= start.o
 SOBJS	= cache.o
 
+ifneq ($(CONFIG_NUM_CPUS),1)
+COBJS-y += mp.o
+SOBJS += release.o
+endif
 COBJS-y	+= traps.o
 COBJS-y	+= cpu.o
 COBJS-y	+= cpu_init.o