Support linux GPIO v2 API

[ardera]

The linux kernels GPIO interface changed in version 5.10. A new version of the interface was introduced and the old one deprecated. The new interface is functionally backwards compatible to the old one (but not ABI-compatible) but introduces some new features that may be useful, for example, no more differentiation between a requested line and an event line (so we can possibly reconfigure a line requested as input to a line that's listening on some signal edges now).