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/qemu_sbsa/platform.mk b/plat/qemu/qemu_sbsa/platform.mk
index 492f0ba..c2fbce5 100644
--- a/plat/qemu/qemu_sbsa/platform.mk
+++ b/plat/qemu/qemu_sbsa/platform.mk
@@ -43,18 +43,10 @@
 QEMU_GIC_SOURCES	:=	${GICV3_SOURCES}				\
 				plat/common/plat_gicv3.c
 
-BL31_SOURCES		+=	${QEMU_CPU_LIBS}				\
-				lib/semihosting/semihosting.c			\
-				lib/semihosting/${ARCH}/semihosting_call.S	\
-				plat/common/plat_psci_common.c			\
-				${PLAT_QEMU_PATH}/sbsa_gic.c 			\
+BL31_SOURCES		+=	${PLAT_QEMU_PATH}/sbsa_gic.c 			\
 				${PLAT_QEMU_PATH}/sbsa_pm.c			\
 				${PLAT_QEMU_PATH}/sbsa_sip_svc.c		\
-				${PLAT_QEMU_PATH}/sbsa_topology.c		\
-				${PLAT_QEMU_COMMON_PATH}/aarch64/plat_helpers.S	\
-				${PLAT_QEMU_COMMON_PATH}/qemu_bl31_setup.c	\
-				common/fdt_fixup.c				\
-				${QEMU_GIC_SOURCES}
+				${PLAT_QEMU_PATH}/sbsa_topology.c
 
 BL31_SOURCES		+=	${FDT_WRAPPERS_SOURCES}