qemu_v8: update Xen version

The Buildroot update [1] brings a new version of Xen. Fix the makefile
accordingly.

Link: [1] https://github.com/OP-TEE/manifest/commit/a4dd5a64d1706e8971f1d5c0ea90a64a1e3f7d4c
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/qemu_v8.mk b/qemu_v8.mk
index adc2d68..6b41d3f 100644
--- a/qemu_v8.mk
+++ b/qemu_v8.mk
@@ -99,7 +99,7 @@
 endif
 
 XEN_PATH		?= $(ROOT)/xen
-XEN_IMAGE		?= $(ROOT)/out-br/build/xen-4.14.3/xen/xen.efi
+XEN_IMAGE		?= $(ROOT)/out-br/build/xen-4.14.5/xen/xen.efi
 XEN_EXT4		?= $(BINARIES_PATH)/xen.ext4
 XEN_CFG			?= $(ROOT)/build/qemu_v8/xen/xen.cfg