Remove old implementation of NitzStateMachine

Remove old implementation of NitzStateMachine as it has been superseded
and it is not used.

Various classes have been moved into the
com.android.internal.telephony.nitz package because they are only associated
with the one remaining implementation.

Bug: 149014708
Test: treehugger
Merged-In: I704bde1d3ca525e5325aaa89c89fba67f2bef66c
Change-Id: I704bde1d3ca525e5325aaa89c89fba67f2bef66c
(cherry picked from commit a4011139)