Removing some of the API don't have to be @SystemApi

Some of the API we made @SystemApi won't be used by mainline
module. Removing these from the surface.

Bug: 151266974
Test: atest FrameworksNetTests
      atest FrameworksTelephonyTests
      atest FrameworksWifiTests

Change-Id: Ie30efa172f93a7557fb6ef56f4daf80e958c3787
Merged-In: Ie30efa172f93a7557fb6ef56f4daf80e958c3787