HFP: Remove used BTA call-in events and methods

* Since SCO over HCI is temporarily unsupported on the stack, SCO data
  call-in methods are no longer used by the stack and thus should be
  removed. For example, bta_ag_ci_sco_data() and BTA_AG_CI_SCO_DATA_EVT.
* Since raw RFCOMM access is disabled, various RFCOMM data call-in
  methods are no longer used by the stack and thus should be removed.
  For example, bta_ag_ci_rx_data() and BTA_AG_CI_RX_WRITE_EVT

Bug: 70538124
Test: runtest bluetooth, native unit test
Change-Id: Iacd60042e97b1be5f800319723836285eb68b2b9