LE Extended Advertising

This patch checks if LE Extended Advertising, and LE Periodic Advertising
features are supported. Also if they are supported, it will read number of
avaliable advertisers, and maximum advertisement data size supported by
controller.

Bug: 30622771
Test: sl4a ConcurrentBleAdvertisingTest
Change-Id: Iabfda3dd081519ed70c99eb4290667e10790e047