luci-proto-qmi: add missing license information

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

protocols/luci-proto-qmi/Makefile

@@ -9,6 +9,8 @@ include $(TOPDIR)/rules.mk
 LUCI_TITLE:=Support for QMI
 LUCI_DEPENDS:=+uqmi
 
+PKG_LICENSE:=Apache-2.0
+
 include ../../luci.mk
 
 # call BuildPackage - OpenWrt buildroot signature