LE: Use random address when initiating background connections

When re-connecting to HID devices, the first reconnection immediately
after a reboot incorrectly uses the static, public Bluetooth address of
the phone/tablet as the own address.

This patch fixes the Bluetooth initialization sequence to make sure
privacy is enabled before any Bluetooth services are started.

Bug: 16952502
Change-Id: I43e595ddc7e347fab972b059382b512fb03e9459