package/v4l2loopback: add V4L2LOOPBACK_CPE_ID_VENDOR

cpe:2.3:o:v4l2loopback_project:v4l2loopback is a valid CPE identifier
for this package:

  https://nvd.nist.gov/products/cpe/search/results?namingFormat=2.3&keyword=cpe%3A2.3%3Ao%3Av4l2loopback_project%3Av4l2loopback



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>