83xx: split COBJS onto separate lines

..plus get rid of some #ifdefs in the .c files.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
diff --git a/cpu/mpc83xx/Makefile b/cpu/mpc83xx/Makefile
index 94a3cb8..7ad7e3e 100644
--- a/cpu/mpc83xx/Makefile
+++ b/cpu/mpc83xx/Makefile
@@ -28,9 +28,19 @@
 LIB	= $(obj)lib$(CPU).a
 
 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 fdt.o
 
+COBJS-y += traps.o
+COBJS-y += cpu.o
+COBJS-y += cpu_init.o
+COBJS-y += speed.o
+COBJS-y += interrupts.o
+COBJS-y += spd_sdram.o
+COBJS-y += ecc.o
+COBJS-$(CONFIG_QE) += qe_io.o
+COBJS-$(CONFIG_83XX_GENERIC_PCI) += pci.o
+COBJS-$(CONFIG_OF_LIBFDT) += fdt.o
+
+COBJS	:= $(COBJS-y)
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
 START	:= $(addprefix $(obj),$(START))