Add NetworkStack to framework-connetivity and framework-tethering impl lib visibility

As NetworkStackApi*Shims modules defined in
packages/modules/NetworkStack depends on the impl libs of
framework-connectivity and framework-tethering

Test: m nothing
Bug: 358613520
Change-Id: I5c90d4ae6eeb51f42f1ae1c88dd726bfdcd093e8
2 files changed