Revert "Remove unused mocks"

Revert submission 1738738
Bug: 191431228
Tag: #refactor
Test: gd/cert/run

Reason for revert: Test Cop test checking
Reverted Changes:
I97a6d10c9:test: Fix net_test_osi
Ib514252d0:Make stack_smp_test host runnable
I77e9a079c:Update test/mock_stack_acl
Ia8a2896ca:Canonicalize include pathnames
Ibc4d03fc1:Add test/mock_btif_bluetooth
Id4733a3af:Remove unused mocks
Ifebdb31ec:Re-point stack tests to use centralized test/mock

Change-Id: Ia67e02eee172b26214a13d4dbdb665fa5fbaf842