Replace @hide API with public API

ProxyInfo is inculded in framework-connectivity module
which should not have external dependencies on its hidden API.
Thus, migrate getExclusionListAsString to getExclusionList.

Bug: 178777253
Test: build
Change-Id: I64b9d5be062bec43c7be3ea68d1f63054319df2d

Change-Id: I400df793fc669d0e574fb4cf022d021d99859d53
3 files changed