powerpc/mpc85xx: new SPL support for IFC NAND

Linker script is not able find start.o binary. So add its absolute path in
u-boot-spl.lds. This change is similar to u-boot-nand.lds

common/Makefile: Avoid compiling unnecssary files

fsl_ifc_spl.c : It is is responsible for reading u-boot binary from
NAND flash and copying into DDR. It also transfer control from NAND SPL
to u-boot image present in DDR.

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 8821704..bb81e84 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -83,6 +83,7 @@
 else  # minimal SPL drivers
 
 COBJS-$(CONFIG_NAND_FSL_ELBC) += fsl_elbc_spl.o
+COBJS-$(CONFIG_NAND_FSL_IFC) += fsl_ifc_spl.o
 COBJS-$(CONFIG_NAND_MXC) += mxc_nand_spl.o
 
 endif # drivers