The lldp_class and lldp_location config option are only valid when
compiled with LLDP-MED support. If not they will cause lldpd not to
start.

Signed-off-by: Sebastian Pflieger <sebastian@pflieger.email>
Link: https://github.com/openwrt/openwrt/pull/17571


Signed-off-by: Robert Marko <robimarko@gmail.com>
(cherry picked from commit 2c22d7c3)