Create interrupts.c and modify Makefile

interrupt_init() and dtimer_intr_setup() are placed in interrupts.c. Added interrupts.o to Makefile

Signed-off-by: TsiChungLiew <Tsi-Chung.Liew@freescale.com>
diff --git a/cpu/mcf532x/Makefile b/cpu/mcf532x/Makefile
index 452848d..6790d90 100644
--- a/cpu/mcf532x/Makefile
+++ b/cpu/mcf532x/Makefile
@@ -28,7 +28,7 @@
 LIB	= lib$(CPU).a
 
 START	=
-COBJS	= cpu.o speed.o cpu_init.o
+COBJS	= cpu.o speed.o cpu_init.o interrupts.o
 
 SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))