usb: gadget: mass_storage: added sysfs entry for cdrom to LUNs

This patch adds a "cdrom" sysfs entry for each mass_storage LUN, just
like "ro" sysfs entry. This allows switching between USB and CD-ROM
emulation without reinserting the module or recompiling the kernel.

Change-Id: Idf83c74815b1ad370428ab9d3e5503d5f7bcd3b6
Revert "usb: gadget: mass_storage: added sysfs entry for cdrom to LUNs"

This reverts commit f8e8c98150c38dd3e7718b3e1a29b0acc36818c4.

Change-Id: I5373e681eeaf2c01f5a51f92dad83cf6345636da
Compilation fixes

Change-Id: I9af9bd5ee309175dcbdb77bb6d98cd7b1b0ba8cd
Signed-off-by: Brandon McAnsh <brandon.mcansh@gmail.com>