Protect againt calling LWIP_Ethernet::begin twice #2158
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As seen in debug of #2149, if the LwipIntfDev is already _started, return false for a ::begin() call. Also, protect netif_add/_remove on the very small possibilty of being called by LwipIntfDev devices while the CYW43 driver is doing work.
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As seen in debug of #2149, if the LwipIntfDev is already _started, return false for a ::begin() call.
Also, protect netif_add/_remove on the very small possibilty of being called by LwipIntfDev devices while the CYW43 driver is doing work.