mpc83xx: convert to using do_fixup_*()

convert to using simpler mpc85xx style fdt update code; streamline by
eliminating macros OF_SOC, OF_CPU, etc. which allows us to rm
the old school FLAT_TREE code from 83xx (since the sbc8349 was just
converted over to using libfdt).

Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/cpu/mpc83xx/Makefile b/cpu/mpc83xx/Makefile
index 2329970..94a3cb8 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 ecc.o qe_io.o pci.o
+	  spd_sdram.o ecc.o qe_io.o pci.o fdt.o
 
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))