USB: move many drivers to use DEVICE_ATTR_RO

Instead of "open coding" a DEVICE_ATTR() define, use the DEVICE_ATTR_RO() macro instead, which does everything properly instead.

This does require a few static functions to be renamed to work properly, but thanks to a script from Joe Perches, this was easily done.

Reported-by Joe Perches <[email protected]>

Cc Matthieu CASTET <[email protected]>

Cc Stanislaw Gruszka <[email protected]>

Cc Oliver Neukum <[email protected]>

Cc Pete Zaitcev <[email protected]>

Cc Felipe Balbi <[email protected]>

Cc Alan Stern <[email protected]>

Signed-off-by Greg Kroah-Hartman <[email protected]>