Only allow libconnectivity_native usage on U+

No user of the API is expected before U, so limit its usage to U+.

Bug: 262199896
Test: atest
(cherry picked from https://android-review.googlesource.com/q/commit:2c1b9b8e80c6cb017a03211667b51ee5b1234d1c)
Merged-In: I211f459a729c216eb1ba9e3b983042e4afcbd135
Change-Id: I211f459a729c216eb1ba9e3b983042e4afcbd135
2 files changed