usb_modeswitch: bump to version 2.1.0

Version 2.1.0, 2014/01/28
    ATTENTION: -I flag meaning reversed, default is to skip SCSI inquiry;
    introduction of StandardEject, replacing many MessageContents with the
    same function, reducing size of device config files, and always including
    the 'Allow Medium Removal' before ejecting (thanks to Lars Melin for
    the idea); fix in "bulk_read", removing bogus CSW request (report from
    "Sonya@zte")

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>