USB: f_mass_storage: Added cdrom option to UMS-lun-devices

This patch allows programs to change the cdrom option at runtime
through sysfs.

Change-Id: I30a0ffc7f6e9a7f12d95ca1ab07949868aba440c
USB: f_mass_storage: 2048 block size for cdrom devices

Bios will recognize the cdrom device like most other cdrom
devices. This allows people to boot ISOs from their phone.

Original by Andreas Kemnade:
http://www.spinics.net/lists/linux-usb/msg25178.html

Change-Id: Id8fba96e1683f6daa6330b1e59f4a4ca4fe5c271
ondemand upgrades courtesy of the Mighty Stratosk
Merge remote-tracking branch 'refs/remotes/git.kernel.org/linux-3.0.y' into cm-10.1