Update AM/FM radio QML plugin to version 0.2

This commit upgrades qml-radio-plugin to version 0.2, which :
- implements PulseAudio support (will work automatically if
  we enable it inside AGL) ;
- fixes QML properties and types as requested in [*] ;
- fixes sound stuttering issues.

It also puts the non-mandatory QML sample in a separate
"examples" package, thus avoiding building qtquickcontrols
if we do not need it.

[*] : http://lists.linuxfoundation.org/pipermail/
automotive-discussions/2015-December/001244.html

Change-Id: I2b173d8bb1c4055b2c7ac0c4691d802c2eb5f61f
Signed-off-by: Manuel Bachmann <mbc@iot.bzh>