powerpc/85xx: Add is_serdes_configured() support for MPC8544 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: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/cpu/mpc85xx/Makefile b/arch/powerpc/cpu/mpc85xx/Makefile
index 78bc27a..dbb53c8 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_MPC8544) += mpc8544_serdes.o
 COBJS-$(CONFIG_MPC8548) += mpc8548_serdes.o
 COBJS-$(CONFIG_MPC8568) += mpc8568_serdes.o
 COBJS-$(CONFIG_MPC8569) += mpc8569_serdes.o