misc: Forward declare the load_timer_start to address compiler warning
misc: Forward declare the load_timer_start to address compiler warning

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