qemu: update bios image path in target check

Fixes: 46ddff2b339b ("qemu: boot from arm-tf")

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Tested-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
diff --git a/qemu.mk b/qemu.mk
index ad78511..cd7adce 100644
--- a/qemu.mk
+++ b/qemu.mk
@@ -181,7 +181,7 @@
 CHECK_DEPS := all
 endif
 
-check-args := --bios $(ROOT)/out/bios-qemu/bios.bin
+check-args := --bios $(BINARIES_PATH)/bl1.bin
 ifneq ($(TIMEOUT),)
 check-args += --timeout $(TIMEOUT)
 endif