RISC-V Patches for the 6.8 Merge Window, Part 4

This includes everything from part 2:

* Support for tuning for systems with fast misaligned accesses.
* Support for SBI-based suspend.
* Support for the new SBI debug console extension.
* The T-Head CMOs now use PA-based flushes.
* Support for enabling the V extension in kernel code.
* Optimized IP checksum routines.
* Various ftrace improvements.
* Support for archrandom, which depends on the Zkr extension.

and then also a fix for those:

* The build is no longer broken under NET=n, KUNIT=y for ports that
  don't define their own ipv6 checksum.
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