usb: f_mass_storage: Allow rw for cdrom lun attribute
usb: f_mass_storage: Allow rw for cdrom lun attribute

For CDROM lun, the necessary LUN mapping with iso image
needs to be done from userspace. Fix the lun attribute
to allow rw.

Change-Id: Ia360652a86df69581a0fcd9fd80f45eba9e51636
Signed-off-by: Sujeet Kumar <e9b8a01032c7daf1cc5b14666510ad9581521595@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas