Assign conscrypt to core-platform hiddenapi domain

Conscrypt accesses internals of libcore, assign it to core-platform
domain accordingly.

Bug: 125701194
Bug: 119068555
Bug: 127269864
Test: compiles, boots, no violations conscrypt
Change-Id: I3ee26d8cebcc9c74bd9f3e6e03278378efe9db43
3 files changed