WificondControl: Expose methods for softap operations

wificond iface handles need to be managed by WificondControl. So,
expose methods in WificondControl to start/stop SoftAp operations.
WificondControl will use the active iface handle internally to invoke
binder calls on them.

To support concurrent ifaces, these methods will accept an
iface name to map to the corresponding iface handles. This will be done
in follow up CL's.

Bug: 69163134
Test: Unit tests
Test: Soft AP starts and able to connect to it.
Change-Id: I600af3cd453fd3d3fd2b87e67bbfb552b0985cd2
5 files changed