MT7621 OC and VPN

[LGA1150]

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OpenVPN DCO optimization (mt7621, filogic)

The OpenVPN DCO kernel module handles asynchronous crypto requests inefficiently, waiting for each request to complete before starting the next one. An official DCO patchset has been submitted upstream with improved async request handling. However, it is currently incompatible with the existing OpenVPN userspace version. https://lore.kernel.org/netdev/20250211-b4-ovpn-v19-0-86d5daf2a47a@openvpn.net/ To bridge this gap, I created a fork that incorporates these changes, tested on OpenWrt 22. …