Reduce memory footprint by releasing parsed config

Once the interop static config file has been loaded into the dynamic
interop list we no longer need it.
By releasing it we hope to reduce the memory overhead that the interop
database is generating

Bug: 266785710
Bug: 252903680
Test: atest net_test_device
Change-Id: Ic388d615d5dcf526c34bff37562e8097c2d6fa8d