Save reversed BR/EDR link key derived from LE LTK

Authentication is failed between Android Q and Android P or earlier when derived link key is used.

Repro steps:
1. Try to LE connect & pair(LE secure connection) with Android P device from Android Q device
2. Try to connect PAN from Android Q device to Android P device
3. Connection failed

This issue is caused by the following change.
https://android.googlesource.com/platform/system/bt/+/fc22b0f43849362bdd958cc518d4e4e54b654c8c

This fix just reverts removed line from the previous change.
Bug: 143940249
Change-Id: I5d18cdd76b6c436dad010caf514ab0d78997f091