Fix invalid BDA parameter passing for connection parameter updates

The BD_ADDR type is not a struct, just an array of bytes. Therefore,
Bind does not know how to store it for later execution, and just stores
the pointer to the first element, which is not valid at time of
execution.

Instead use bt_bdaddr_t, which is a struct. Bind will copy it's content
properly.

Change-Id: I4875aae4d7cbb809821d91a13554b8fdf310a7fe