Create shared RawAddress in topshim

This change consolidates a few BT addr into just one
shared struct under btif.

- Move BDAddr to btif and rename it to RawAddress.
- Use the new RawAddress as the shared addr struct.
- Create FfiAddress in each topshim submodule and
convert between the shared RawAddress at ffi boundary.

Bug: 189497374
Tag: #floss
Test: Manual test with audio server changes

Change-Id: I8e445d3292241ddecb97cbeb169b468a397a9bff