Make VcnTransportInfoTest pass on AOSP.

AOSP contains the core networking redaction changes, but not the
wifi redaction changes, so the tests that depend on wifi S
behaviour will not pass on AOSP.

Fix testApplicableRedactions by checking that the applicable
redactions are the same ones as returned by the underlying
WifiInfo object.

Fix testMakeCopyRedactForAccessFineLocation by testing the wifi
redaction code iff Build.VERSION.SDK_INT is S or later. This is
different from SdkLevel.isAtLeastS, because the latter returns
true in AOSP.

Bug: 183938194
Test: atest VcnTransportInfoTest
Change-Id: Ia5bc896c92be19f570638f8051492e0f2d7342f9