Merge changes I7876611d,I9f640034,Ia9b4f580,I881c1c82,I302e27b7, ...

* changes:
  Flatten BTIF_CORE_STORAGE_ADAPTER_READ
  Simplify btif_get_adapter_property
  Flatten BTIF_CORE_STORAGE_ADAPTER_READ_ALL
  Simplify btif_get_adapter_properties
  Flatten BTIF_DM_CB_LE_TEST_END and remove btif_dm_generic_evt
  Flatten BTIF_DM_CB_LE_(TX|RX)_TEST
  Flatten BTIF_DM_CB_BOND_STATE_BONDING
  Flatten BTIF_DM_CB_REMOVE_BOND