Removing endeavoru lun_cdrom flag to let ums work rw instead of ro.

Change-Id: I62dcaba8dcd5055422c55f60f304b7fd8d2c27c1
Disable OS check for the mass storage gadget

This fixes UMS on Linux because the correct interface class will be reported.

Change-Id: I6c491bf416d8f1186bea006bf2b4b0fecb9e1ab0