Wifi: Handle invalid error values from vendor HAL

The HAL shim (default implementation) expects all vendor hal functions
to return valid wifi_error values. In case the vendor hal returning a
value outside this range of values, the HAL service crashes.

This commit is to handle this type of error by defaulting to
WIFI_ERROR_UNKNOWN.

Bug: 143317834
Test: Manual
Test: Pass an invalid error code, and make sure it is properly handled
Change-Id: Ifaba8a7e4e866a2be154c9dcaeb521cd758010ee

wifi/1.4/default/wifi_status_util.cpp

@@ -46,6 +46,8 @@ std::string legacyErrorToString(legacy_hal::wifi_error error) {
             return "BUSY";
         case legacy_hal::WIFI_ERROR_UNKNOWN:
             return "UNKNOWN";
+        default:
+            return "UNKNOWN ERROR";
     }
 }
 
@@ -92,6 +94,10 @@ WifiStatus createWifiStatusFromLegacyError(legacy_hal::wifi_error error,
 
         case legacy_hal::WIFI_ERROR_UNKNOWN:
             return createWifiStatus(WifiStatusCode::ERROR_UNKNOWN, "unknown");
+
+        default:
+            return createWifiStatus(WifiStatusCode::ERROR_UNKNOWN,
+                                    "unknown error");
     }
 }