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Add index sysfs attribute for WWAN devices. This index is used to uniquely indentify and reference a WWAN device. 'index' is the attribute name that other device classes use (wireless, v4l2-dev, rfkill, etc...). Signed-off-by: Loic Poulain <loic.poulain@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>