Move sensitive field parceling bool to constructor

This addresses API review comments recommending to use a copy
constructor with additional parameters instead of a dedicated method.
makeSensitiveFieldsParcelingCopy becomes LinkProperties(base, true).

Bug: 150877475
Test: atest FrameworksNetTests NetworkStackTests NetworkStackNextTests
Merged-In: I588a40cd32667aba8e11c663833621b1c441a87a
(cherry picked from commit a148ea2a)

Change-Id: Ibe7c94627c2a6af45b129020808b752207ff82b6