Revert "Add public fields to NetworkScore and make it @SystemApi"

This reverts commit a27e1eef14e575550f112a29d23fa40639387dfd.

Bug: 113554781
Test: FrameworksNetTests FrameworksTelephonyTests FrameworksWifiTests
Change-Id: Ie1e84bd2a16f088307b195f924f4e49335cbe367
12 files changed