mpc83xx: Consolidate the ECC support of 83xx

Remove the duplicated source code of ecc command on the <board>.c,
for reused, move these code to cpu/mpc83xx directory.

Signed-off-by: Dave Liu <daveliu@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/cpu/mpc83xx/Makefile b/cpu/mpc83xx/Makefile
index bb96f77..2329970 100644
--- a/cpu/mpc83xx/Makefile
+++ b/cpu/mpc83xx/Makefile
@@ -29,7 +29,7 @@
 
 START	= start.o
 COBJS	= traps.o cpu.o cpu_init.o speed.o interrupts.o \
-	  spd_sdram.o qe_io.o pci.o
+	  spd_sdram.o ecc.o qe_io.o pci.o
 
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))