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]>
Acked-by: Alan Stern <[email protected]>
Acked-by: Felipe Balbi <[email protected]>
Acked-by: Pete Zaitcev <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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