Android: Fix QML Mediaplayer example issues

The same issues are reproducible as well on multimediawidgets/player example.

• Changing a progress of the video via seek bar does not work on OnePlus7(A11).

               The same issue  is reproducible as well on all of examples with the seek bar.

 
Steps to reproduce:

1. Download sample_2audio_7subtitle_tracks.m4v test file. Link below.
2. Run mediaplayer example on Android device.
3. Open downloaded file.
4. Drag seek bar

Actual:
The drag ball moves, but the video does not follow the ball
See Attachment onePlusSeek.mp4
Expected:
The video follow the ball.

Works fine on Nokia 6.1(A10) and Sony xperia 5(A11)!

• Changing a Audio track of the video issue on Nokia 6.1(A10).

Steps to reproduce:

1. Download sample_2audio_7subtitle_tracks.m4v test file. Link below.
2. Run mediaplayer example on Android device.
3. Open downloaded file.
4. Open Tracks --> Audio menu.
5. Select a last item on the list.

Actual:
The video jumps more than 30 seconds forward.
See Attachment  NokiaChangeAudioTrack.mp4
Expected:
Audio track of the video changes and the video continues in the same place.

Works fine on OnePlus 7(A11) and Sony xperia 5(A11)!

- Subtitles are missing on OnePlus 7.

Steps to reproduce:

1. Download sample_2audio_7subtitle_tracks.m4v test file. Link below.
2. Run mediaplayer example on Android device.
3. Open downloaded file.
4. Open Tracks --> Subtitles menu.

Actual:
The list contains only two subtitles.
Expected:
The list contains eight subtitles.
     
Works fine on Nokia 6.1(A10) and Sony xperia 5(A11)!

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- Audio tracks of the video is only named as Default. 

Actual:
   See Attachment SubtitleListOnlyDefaults.jpg
Expected:
    See Attachment SubtitleList.png (ScreenShot from Host)

Reproducible on OnePlus 7(A11), Nokia 6.1(A10) and Sony xperia 5(A11)!

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Link to test files:
(For qt members only) https://git.qt.io/asboudje/qtmultimedia_samples/-/blob/main/sample_2audio_7subtitle_tracks.m4v
https://github.com/ietf-wg-cellar/matroska-test-files/blob/master/test_files/test5.mkv