ColdFire: Add DSPI support for MCF5227x and MCF5445x

Remove individual CPU specific DSPI driver.
Add required feature for the common DSPI driver in cpu_init and
in platform configuration file.

Signed-off-by: TsiChung Liew <tsicliew@gmail.com>
diff --git a/cpu/mcf5227x/Makefile b/cpu/mcf5227x/Makefile
index 44f9385..d0e9b45 100644
--- a/cpu/mcf5227x/Makefile
+++ b/cpu/mcf5227x/Makefile
@@ -28,7 +28,7 @@
 LIB	= lib$(CPU).a
 
 START	= start.o
-COBJS	= cpu.o speed.o cpu_init.o interrupts.o dspi.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))