lib/android: Fixes audio module tests

Signed-off-by: Frédéric Vachon <fredvac@gmail.com>
lib/android: Added reset method to MediaPlayer

Signed-off-by: Frédéric Vachon <fredvac@gmail.com>
lib/android: Removed deprecated `super Serializable`

Signed-off-by: Frédéric Vachon <fredvac@gmail.com>