Create a builder for NetworkCapabilities.

Bug: 151322799
Test: FrameworksWifiTests
Change-Id: I69c00c9e3963950e55d7105d8825f7d3a3ec9b2f
Merged-In: I06eb97e50d5583579b3c26d1365d2dbaec8bfc99
(cherry picked from commit 9771f34dae9cdeb857636cac2b3c2d473713914e)
8 files changed