Blackberry: Fix playlists not advancing to the next track.
Blackberry: Fix playlists not advancing to the next track.

The playlist watches for state changes to the EndOfMedia state, which
wasn't used in the plugin yet.

Change-Id: Ib2a014177df2273cd46baaef1392a73e54daf06c
Reviewed-by: Kevin Krammer <b2812d1298561dbde414b0e98578376c4dd5479d@kdab.com>
Reviewed-by: Lev Zelenskiy <52589945ccee4e3c60b620e3f7167f3aceca60e2@nokia.com>
Reviewed-by: Sean Harmer <dd3a28a27ba8fc1a24091f8e1ee0edededfbc9cc@kdab.com>

sergiusens/qtmultimedia,mer-qt/qtmultimedia,sergiusens/qtmultimedia,jfaust/qtmultimedia,nezticle/qtmultimedia,jfaust/qtmultimedia,webOS-ports/qtmultimedia,webOS-ports/qtmultimedia,sergiusens/qtmultimedia,jfaust/qtmultimedia,mer-qt/qtmultimedia,jfaust/qtmultimedia,sergiusens/qtmultimedia,mer-qt/qtmultimedia,jfaust/qtmultimedia,webOS-ports/qtmultimedia,webOS-ports/qtmultimedia,nezticle/qtmultimedia,webOS-ports/qtmultimedia,nezticle/qtmultimedia,mer-qt/qtmultimedia,nezticle/qtmultimedia,mer-qt/qtmultimedia,nezticle/qtmultimedia,sergiusens/qtmultimedia