hikey: pm: finish PSCI hook functions

This patch is to enable CPU suspend/resume and system level's
suspend/resume; also enable system power off state.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
diff --git a/plat/hisilicon/hikey/platform.mk b/plat/hisilicon/hikey/platform.mk
index ec4bb5c..fb5f852 100644
--- a/plat/hisilicon/hikey/platform.mk
+++ b/plat/hisilicon/hikey/platform.mk
@@ -65,6 +65,8 @@
 				plat/common/plat_gicv2.c
 
 BL31_SOURCES		+=	drivers/arm/cci/cci.c			\
+				drivers/arm/sp804/sp804_delay_timer.c	\
+				drivers/delay_timer/delay_timer.c	\
 				lib/cpus/aarch64/cortex_a53.S		\
 				plat/common/aarch64/plat_psci_common.c	\
 				plat/hisilicon/hikey/aarch64/hikey_helpers.S \