LE Audio: improve Appearance to CoD mapping

LE Audio devices with appearance of Wearable Device should have "LE Audio" bit in CoD set. Also set other related bits.

Currently, if such device is advertising over LE and Classic at same time, LE Audio bit would flicker.

Bug: 247504761
Test: manual
Change-Id: Ifca26314320ddef360adf5642e2ae1b0c4e84781