Add missing stack dependencies and fix test linker

The net_test_btif_stack reference both the TestMockStack and the
libbt-stack. This shouldn't be the case

Bug: 248126637
Test: atest net_test_btif_stack net_test_stack_btu net_test_stack_acl
Test: atest net_test_bta net_test_stack_smp net_test_stack_gatt_native
Test: atest net_test_stack_gatt_sr_hash_native net_test_stack_hid
Test: atest net_test_stack_gatt net_test_stack_l2cap net_test_main_shim
Change-Id: I7e4fafd63d132cc2353943db304bc852018051c6