Get rid of BTM_IS_PUBLIC_BDA

One can't really guess address type based on last bits.
Instead, for new devices always assume public address.

Test: scan, toggle bluetooth, try connecting to device with public
      address
Bug: 74413120

Change-Id: Id558260798e717c214a5a817cea0c204c5f4858e
(cherry-picked from 8c2e78b44727789d641492beeef873b230c7e568)