package/f2fs-tools: add F2FS_TOOLS_CPE_ID_VENDOR

cpe:2.3:a:f2fs-tools_project:f2fs-tools is a valid CPE identifier for
this package:

  https://nvd.nist.gov/products/cpe/search/results?namingFormat=2.3&keyword=cpe%3A2.3%3Aa%3Af2fs-tools_project%3Af2fs-tools



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>