arm-autonomy: fix building for xen-tools >=4.15

The 0001-vif-nat-fix-hostname.patch is merged in xen-tools
4.15, so fix the layer to apply the patch only for 4.14.

Issue-Id: SCM-2608
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
Change-Id: I1306955ab0b1ee435a8da42e953e142270c4b2d3
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm-autonomy/recipes-extended/xen/xen-tools_%.bbappend

@@ -1,8 +1,3 @@
-FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
-
-SRC_URI += "file://0001-vif-nat-fix-hostname.patch \
-           "
-
 PACKAGECONFIG_remove = "\
     ${@bb.utils.contains('DISTRO_FEATURES', \
                          'arm-autonomy-host', \

meta-arm-autonomy/recipes-extended/xen/xen-tools_4.14.bbappend

@@ -0,0 +1,4 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}-4.14:"
+
+SRC_URI += "file://0001-vif-nat-fix-hostname.patch \
+           "