refactor(qemu): common BL31 sources

Move BL31 source list into common file.

Change-Id: Iaa27cfd8f87b691728379c87a6ff6331e87951e1
Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
diff --git a/plat/qemu/common/common.mk b/plat/qemu/common/common.mk
index 5678278..1914045 100644
--- a/plat/qemu/common/common.mk
+++ b/plat/qemu/common/common.mk
@@ -63,3 +63,13 @@
 				${PLAT_QEMU_COMMON_PATH}/qemu_image_load.c		\
 				common/desc_image_load.c		\
 				common/fdt_fixup.c
+
+BL31_SOURCES		+=	${QEMU_CPU_LIBS}				\
+				lib/semihosting/semihosting.c			\
+				lib/semihosting/${ARCH}/semihosting_call.S	\
+				plat/common/plat_psci_common.c			\
+				${PLAT_QEMU_COMMON_PATH}/aarch64/plat_helpers.S	\
+				${PLAT_QEMU_COMMON_PATH}/qemu_bl31_setup.c	\
+				common/fdt_fixup.c				\
+				${QEMU_GIC_SOURCES}
+