Use dedicated enum for Advertiser Address Type

OwnAddressType is not appropriate since it includes cases that are
impossible in our stack, and merges RPA + NRPA together.

No behavioral changes.

Test: unit
Bug: 268112598
(cherry picked from https://android-review.googlesource.com/q/commit:80c922dc1e33b673af3ff43c0a9928f600c69782)
Merged-In: I9139c5e63cc9d34ed21f0005336e1517c80628f2
Change-Id: I9139c5e63cc9d34ed21f0005336e1517c80628f2
Bug:279962122