hostapd(interface): Add a HIDL interface for hostapd

The HIDL interface exposes 2 methods:
1) addAccessPoint - Starts an access point on the specified interface
with params.
2) removeAccessPoint - Removes a previously started access point.

Bug: 36646171
Test: Compiles
Change-Id: I020f25a74f505e7fa4cfdfc25efb512456021877
3 files changed