SPMD: register the SPD PM hooks

Change-Id: If88d64c0e3d60accd2638a55f9f3299ec700a8c8
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/services/std_svc/spmd/spmd.mk b/services/std_svc/spmd/spmd.mk
index 38d43f1..73f7c85 100644
--- a/services/std_svc/spmd/spmd.mk
+++ b/services/std_svc/spmd/spmd.mk
@@ -10,6 +10,7 @@
 
 SPMD_SOURCES	+=	$(addprefix services/std_svc/spmd/,	\
 			${ARCH}/spmd_helpers.S			\
+			spmd_pm.c				\
 			spmd_main.c)
 
 # Let the top-level Makefile know that we intend to include a BL32 image