BTM_API Shim: Call BTA sp_cback for events

    - IO Capability Request
    - IO Capability Response
    - User Confirmation Request

Bug: 159815595
Tag: #gd-refactor
Test: cert/run --host SecurityTest
Test: atest --host bluetooth_test_gd
Test: Manual testing with hybrid stack
Change-Id: I30aee8b7c29d6784d62fb5d900fee7bb223aaf10