lldpd: Implement location parameter

lldpd: Implement location parameter

Previously only partially implemented. After commit
5007f488bb5e1b556052ef246bd3822fed8d09d2 lldp_location was never removed

Now, add the value of lldp_location to the generated config.

The location param has a few syntaxes, so the config acquires the first
usage from the man page: 'address country EU'

Supplementary fix for PR #14193 (this param was included in the original
PR #13018 but the lldp_location fixes were absent from PR #14193).

Tested on 22.03.5, 22.03.6

Signed-off-by: Paul Donald <newtwen@gmail.com>
(cherry picked from commit 53252eeb3b6177b77e23235436b04818a88eafe0)
Link: https://github.com/openwrt/openwrt/pull/15299
Signed-off-by: Robert Marko <robimarko@gmail.com>