mpc5121: Move iopin features from board specific to common files.

And in the process eliminate some duplicate register defines.

Signed-off-by: Kenneth Johansson <kenneth@southpole.se>
diff --git a/board/ads5121/Makefile b/board/ads5121/Makefile
index 5b95682..52d0d3c 100644
--- a/board/ads5121/Makefile
+++ b/board/ads5121/Makefile
@@ -27,7 +27,7 @@
 
 LIB	= $(obj)lib$(BOARD).a
 
-COBJS-y	:= $(BOARD).o iopin.o
+COBJS-y	:= $(BOARD).o
 COBJS-${CONFIG_FSL_DIU_FB} += ads5121_diu.o
 COBJS-${CONFIG_FSL_DIU_FB} += ../freescale/common/fsl_diu_fb.o
 COBJS-${CONFIG_FSL_DIU_FB} += ../freescale/common/fsl_logo_bmp.o