Add a switch, that will switch to mass_storage. (1/3)
This is used on OPPO devices to be able to show a cdrom drive instead mtp or ptp.

To enable this use overlay:
	<bool name="mass_storage_as_cdrom" translateable="false">true</bool>

Change-Id: Ibc31a5abc7c5d1b0e69485f0d4465244bf8a672f