[as2_platform_dji_osdk] Uplink and downlink topic name as parameters

[pariaspe]

          Uplink and downlink topic name may be a parameter too

Originally posted by @RPS98 in aerostack2/aerostack2#309 (comment)

[RPS98]

@pariaspe it has already be done?

[pariaspe]

No, it's not done yet