Add NOT_ROAMING to bluetooth network capabilities.

Bug: b/69113950
Fixes: b/69113950
Test: manual: flashed, tested BT tethering working.
(Clean cherry-pick from aosp Ic5ab5bf3985bce5cd9dd679fd2f88f7f8efc4e55)
Merged-In: Ic6ae2edde1b76d00681fa35826c3f18c78655cde
Merged-In: I9768e585a6182d7bb0553b0d046a1a851f182ac6

Change-Id: I9cb633fbea188e3ef9c9426fa28a1d7c85964ad1