net: wwan: Add WWAN port type attribute
The port type is by default part of the WWAN port device name. However device name can not be considered as a 'stable' API and may be subject to change in the future. This change adds a proper device attribute that can be used to determine the WWAN protocol/ type. Signed-off-by: Loic Poulain <loic.poulain@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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