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
Merge pull request #4 from FrozenCow/frozencow_sony_msm8974ab_master_kk-4.4.2_gadget_cdrom

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