USB: gadget: f_mass_storage: get rid of DEVICE_ATTR() usage

The last holdout in the drivers/usb/* tree using DEVICE_ATTR() is the
f_mass_storage driver, so move it to use DEVICE_ATTR_RW() instead.  The
mode is overridden in the is_visible callback to set it properly
depending on if this is a cdrom or removable device.

Cc: Felipe Balbi <[email protected]>
Cc: Alan Stern <[email protected]>
Cc: Maxim Devaev <[email protected]>
Cc: Wesley Cheng <[email protected]>
Cc: Neal Liu <[email protected]>
Cc: Roger Quadros <[email protected]>
Cc: Nikita Yushchenko <[email protected]>
Cc: Cai Huoqing <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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