Android add support for qrc in mediaplayer.

[ChangeLog][QtMultimedia][Android] Enable mediaplayer to read files
from the Qt Resource system.

Task-number: QTBUG-31422

Change-Id: Iaaefb35566b623b78b9f8aa22daf6ac92fb35e67
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>