Use device privacy mode as default

This change configures device privacy mode for each
remote device added to the resolving list.
Before exercising the privacy command it confirms
whether the set privacy HCI command is supported.

This patch is based on CAF patch by niarora@codeaurora.org
36fa3c528d2ae58e0b3f969665e3d25986dcdbaa

Test: manual
Bug: 35935853
Change-Id: I839045ccc3ddb73dc9c0cbe05d87c25dae9b9236