Double check if extended scanning is supported

Some controllers report support for Set Extended Scanning Enable
although they don't support extended advertising or scanning.

Bug: 229234090
Tag: #compatibility
Test: start Bluetooth on an affected controller
Change-Id: Ia2de7dbc998fe4b770a65ba5cc2329a12c991222
Merged-In: Ia2de7dbc998fe4b770a65ba5cc2329a12c991222
(cherry picked from commit 2bf0e0c8)