Introduction of fake radio backend to enable testing the radio APIs

Includes some behavior for all standard methods.
Also fixes a typo in qradiotunercontrol.h and a couple of minor
bugs in the radio example that came to light using this new
backend.

Change-Id: I65b8b8715a46f0fd702f9630ea81f7d5df527055
Reviewed-on: http://codereview.qt.nokia.com/3619
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Dmytro Poplavskiy <dmytro.poplavskiy@nokia.com>
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

src/plugins/plugins.pro

@@ -33,7 +33,8 @@ unix:!mac {
         SUBDIRS += audiocapture
     }
 
-    !maemo*:SUBDIRS += v4l
+    # v4l is turned off because it is not supported in Qt 5
+    # !maemo*:SUBDIRS += v4l
 
     contains(config_test_pulseaudio, yes) {
         SUBDIRS += pulseaudio
@@ -44,3 +45,7 @@ mac:!simulator {
     SUBDIRS += audiocapture
     !qpa: SUBDIRS += qt7
 }
+
+# fake radio to test the radio APIs
+SUBDIRS += fakeradio
+