Add the missing license information PKG_LICENSE and PKG_LICENSE_FILES.
Signed-off-by: Florian Eckert <fe@dev.tdt.de>
(cherry picked from commit 7a3deadf91)
Link: https://github.com/openwrt/openwrt/pull/15918
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>