Add the link capacity estimate system API. Remove the system API of getCarrierBandwidth() and CarrierBandwidth as they are replaced by the new LCE system API in PhoneStateListener. Bug: 180434672 Bug: 176814680 Test: manual test of the new LCE system API in LinkBandwidthEstimator Test: atest -c PhoneStateListenerTest Merged-In: I5899acf02006a164e31f9b82aeaa7974dd6d2869 Change-Id: I5899acf02006a164e31f9b82aeaa7974dd6d2869