MPC5121e ADS PCI support take 3

Adds PCI support for MPC5121

Tested with drivers/net/rtl8139.c

Support is conditional since PCI on old silicon does not work.

ads5121_PCI_config turns on PCI

In this version, condition compilation of PCI code has been moved
from ifdef in board/ads5121/pci.c to board/ads5121/Makefile as
suggested by Jean-Christophe PLAGNIOL-VILLARD

Signed-off-by: John Rigby <jrigby@freescale.com>
diff --git a/board/ads5121/Makefile b/board/ads5121/Makefile
index cd8148c..b93bee1 100644
--- a/board/ads5121/Makefile
+++ b/board/ads5121/Makefile
@@ -25,8 +25,10 @@
 
 LIB	= $(obj)lib$(BOARD).a
 
-COBJS	:= $(BOARD).o
+COBJS-y	:= $(BOARD).o
+COBJS-$(CONFIG_PCI) += pci.o
 
+COBJS	:= $(COBJS-y)
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 SOBJS	:= $(addprefix $(obj),$(SOBJS))