Do not call DIS_ReadDISInfo if LE ACL is not up

* Only call DIS_ReadDISInfo during metdata update if LE ACL is already up
* If LE ACL is disconnected when metdata is updated and original
  connection used RPA, try calling DIS_ReadDISInfo btif_dm_ble_auth_cmpl_evt
  where RPA is already consolidated into identity address
* Move a few methods in btif_dm.cc up so that code still compiles

Bug: 337087330
Bug: 322464947
Bug: 337998148
Test: pair using Fast Pair with LE Audio capable device
Test: m -j85
Flag: com.android.bluetooth.flags.read_model_num_fix
Change-Id: I87b6c32f5436189cdd835fbc5afb44873a69afea