package/xen: add CPE variables

cpe:2.3:o:xen:xen is a valid CPE identifier for this package:

  https://nvd.nist.gov/products/cpe/search/results?namingFormat=2.3&keyword=cpe%3A2.3%3Ao%3Axen%3Axen

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/xen/xen.mk

@@ -8,6 +8,8 @@ XEN_VERSION = 4.14.1
 XEN_SITE = https://downloads.xenproject.org/release/xen/$(XEN_VERSION)
 XEN_LICENSE = GPL-2.0
 XEN_LICENSE_FILES = COPYING
+XEN_CPE_ID_VENDOR = xen
+XEN_CPE_ID_PREFIX = cpe:2.3:o
 XEN_DEPENDENCIES = host-acpica host-python3
 
 # Calculate XEN_ARCH