powerpc/85xx: Add is_serdes_configured() support for MPC8572 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: Chenhui Zhao <b26998@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 a2c844d..9ec19bb 100644
--- a/arch/powerpc/cpu/mpc85xx/Makefile
+++ b/arch/powerpc/cpu/mpc85xx/Makefile
@@ -78,6 +78,7 @@
 
 # SoC specific SERDES support
 COBJS-$(CONFIG_MPC8536) += mpc8536_serdes.o
+COBJS-$(CONFIG_MPC8572) += mpc8572_serdes.o
 COBJS-$(CONFIG_P1013)	+= p1013_serdes.o
 COBJS-$(CONFIG_P1022)	+= p1022_serdes.o
 COBJS-$(CONFIG_P2010)	+= p2020_serdes.o