ios: convert to new logging infrastructure

Change-Id: Ia62a585acfb55c35aa859553d24cb0e20600b46a
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

src/plugins/ios/iosplugin.cpp

@@ -52,6 +52,9 @@
 #include <projectexplorer/devicesupport/devicemanager.h>
 
 namespace Ios {
+namespace Internal {
+Q_LOGGING_CATEGORY(iosLog, "qtc.ios.common")
+}
 
 IosPlugin::IosPlugin()
 {