plays a looping tune on the vsh
/*
* vshbgm - system menu music, anyon?
*
* This program is licensed under the GPL-v2 license.
* https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html
*
* heavily inspired by mp3play_lite - code from ARK4 and CXMB:
* https://github.com/PSP-Archive/MP3PlayerPlugin/
* https://github.com/PSP-Archive/ARK-4/
* https://github.com/PSP-Archive/CXMB
*/