Add support for SCMI AP core configuration protocol v1.0

Change-Id: If07000b6b19011e960336a305a784dd643301b97
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>
diff --git a/plat/arm/css/common/css_common.mk b/plat/arm/css/common/css_common.mk
index 72d5527..29dd01d 100644
--- a/plat/arm/css/common/css_common.mk
+++ b/plat/arm/css/common/css_common.mk
@@ -32,6 +32,7 @@
 				plat/arm/css/drivers/scpi/css_scpi.c
 else
 BL31_SOURCES		+=	plat/arm/css/drivers/scp/css_pm_scmi.c		\
+				plat/arm/css/drivers/scmi/scmi_ap_core_proto.c	\
 				plat/arm/css/drivers/scmi/scmi_common.c		\
 				plat/arm/css/drivers/scmi/scmi_pwr_dmn_proto.c	\
 				plat/arm/css/drivers/scmi/scmi_sys_pwr_proto.c	\