CSS: Use SCMI AP core protocol to set the warm boot entrypoint

Change-Id: Iaebbeac1a1d6fbd531e5694b95ed068b7a193e62
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>
diff --git a/plat/arm/common/arm_bl1_setup.c b/plat/arm/common/arm_bl1_setup.c
index d141f64..34e0a29 100644
--- a/plat/arm/common/arm_bl1_setup.c
+++ b/plat/arm/common/arm_bl1_setup.c
@@ -144,7 +144,7 @@
 	 * in order to release secondary CPUs from their holding pen and make
 	 * them jump there.
 	 */
-	arm_program_trusted_mailbox(ep_info->pc);
+	plat_arm_program_trusted_mailbox(ep_info->pc);
 	dsbsy();
 	sev();
 #endif