Bluetooth: Simplify advertising API

Instead of requiring application to provide both advertising type
and address type used just require app to provide info if advertising
is connectable or not. Advertising type is set based on provided
SCAN_RSP and local privacy support.

When local privacy is enabled it is no longer possible to advertise
using identity address. If such feature is to be required later on
advertising options can be extended.

This gives BT stack full control over what type of address is used
for advertising and is a preparation for random address rotation
and OOB support.

Change-Id: I90e9a683ef3794f155707343c874f75585439325
Signed-off-by: Szymon Janc <ext.szymon.janc@tieto.com>