Remove DtimMultiplierController relevant logic.

Given that we can leverage the IpClientCallbacks#setMaxDtimMultiplier to
deliver a maximum acceptable DTIM multiplier to use, remove the original
DtimMultiplierController class to de-duplicate the implementation.

Bug: 266256943
Test: atest com.android.server.wifi
Change-Id: I8e0c6f875d250b03f8ceb7a64eb39f36efc61ce4
3 files changed