powerpc/85xx: Add is_serdes_configured() support for P2020 SERDES

Add the ability to determine if a given IP block connected on SERDES is
configured.  This is useful for things like PCIe and SRIO since they are
only ever connected on SERDES.

Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/cpu/mpc85xx/Makefile b/arch/powerpc/cpu/mpc85xx/Makefile
index e14ed01..a2c844d 100644
--- a/arch/powerpc/cpu/mpc85xx/Makefile
+++ b/arch/powerpc/cpu/mpc85xx/Makefile
@@ -80,6 +80,8 @@
 COBJS-$(CONFIG_MPC8536) += mpc8536_serdes.o
 COBJS-$(CONFIG_P1013)	+= p1013_serdes.o
 COBJS-$(CONFIG_P1022)	+= p1022_serdes.o
+COBJS-$(CONFIG_P2010)	+= p2020_serdes.o
+COBJS-$(CONFIG_P2020)	+= p2020_serdes.o
 COBJS-$(CONFIG_PPC_P4080) += p4080_serdes.o
 
 COBJS	= $(COBJS-y)