Fix dual stack UDP bind behavior with LWIP_IPV6_DEFINES_ONLY

[avtolstoy]

Problem

UDP socket when bound to AF_INET6 IN6ADDR_ANY address, should normally work in dual-stack mode. With recent optimizations for Gen 3 platforms introducing LWIP_IPV6_DEFINES_ONLY, this got broken.

Solution

particle-iot/lwip#15

Steps to Test

1. NETWORK_01_LargePacketsDontCauseIssues_ResolveMtu should pass
2. TCPServer should also work (tested)

Example App

N/A

References

• Fix dual stack UDP bind behavior with LWIP_IPV6_DEFINES_ONLY lwip#15

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Completeness

• User is totes amazing for contributing!
• Contributor has signed CLA (Info here)
• Problem and Solution clearly stated
• Run unit/integration/application tests on device
• Added documentation
• Added to CHANGELOG.md after merging (add links to docs and issues)