sysmobts: Help in calling the right callback for l1if_req_compl
sysmobts: Help in calling the right callback for l1if_req_compl

The wait list code has a limitation that for two requests of the
same kind it does not know where the confirmation belongs to. This
limitation is triggered when two lchan's get activated/deactivated
at the same time and is noticed once we start to count the SAPIs.

Set the hLayer3 to the lchan identifier, use the trx as closure for
the callback and resolve the lchan in the callback using these two
bits of information.

shimaore/osmo-bts,telenoobie/osmo-bts,geosphere/osmo-bts,geosphere/osmo-bts,telenoobie/osmo-bts,shimaore/osmo-bts,telenoobie/osmo-bts,osmocom/osmo-bts,shimaore/osmo-bts,osmocom/osmo-bts,osmocom/osmo-bts,geosphere/osmo-bts,geosphere/osmo-bts,shimaore/osmo-bts,telenoobie/osmo-bts