package/bluez5_utils: add CPE variables

cpe:2.3:a:bluez:bluez is a valid CPE identifier for this package:

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



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Peter: fix s/BLUEZ5_CPE/BLUEZ5_UTILS_CPE/ typo]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>