WiFi: enable any combination of STA/AP/P2P/NAN interfaces.

The total number of interfaces is still limited to 2,
will be addressed in a separate change.

Bug: 36120314
Test: KitchenSink (see go/aae-dual-ap)
Test: b/120081854
Change-Id: I8962c5167fcbe55805fce320f639d37b4b902c5c
diff --git a/wifi/1.3/default/wifi_legacy_hal.cpp b/wifi/1.3/default/wifi_legacy_hal.cpp
index 84a2c03..2b90f92 100644
--- a/wifi/1.3/default/wifi_legacy_hal.cpp
+++ b/wifi/1.3/default/wifi_legacy_hal.cpp
@@ -551,6 +551,7 @@
                         on_results_user_callback(id, cached_scan_results);
                         return;
                     }
+                    FALLTHROUGH_INTENDED;
                 }
                 // Fall through if failed. Failure to retrieve cached scan
                 // results should trigger a background scan failure.