gve: Use link status register to report link status
This makes the driver better aware of the connectivity status of the device. Based on the device's status register, the driver can call netif_carrier_{on,off}. Reviewed-by: Yangchun Fu <yangchun@google.com> Signed-off-by: Patricio Noyola <patricion@google.com> Signed-off-by: David Awogbemila <awogbemila@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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