qemu: replace deprecated plat_psci_common.c

Change to compile with new plat/common/plat_psci_common.c instead of the old
deprecated plat/common/aarch64/plat_psci_common.c

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/plat/qemu/platform.mk b/plat/qemu/platform.mk
index dc3b5d9..76c7a14 100644
--- a/plat/qemu/platform.mk
+++ b/plat/qemu/platform.mk
@@ -72,7 +72,7 @@
 				drivers/arm/gic/v2/gicv2_helpers.c	\
 				drivers/arm/gic/v2/gicv2_main.c		\
 				drivers/arm/gic/common/gic_common.c	\
-				plat/common/aarch64/plat_psci_common.c	\
+				plat/common/plat_psci_common.c		\
 				plat/qemu/qemu_pm.c			\
 				plat/qemu/topology.c			\
 				plat/qemu/aarch64/plat_helpers.S	\