Merge patch series "riscv,isa fixups"

Conor Dooley <[email protected]> says:

From: Conor Dooley <[email protected]>

I noticed ~today~ while looking at the isa manual that I had not
accounted for another couple of edge cases with my regex. As before, I
think attempting to validate the canonical order for multiletter stuff
makes no sense - but we should totally try to avoid false-positives for
combinations that are known to be valid.

* b4-shazam-merge:
  dt-bindings: riscv: fix single letter canonical order
  dt-bindings: riscv: fix underscore requirement for multi-letter extensions

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

diff --cc Documentation/devicetree/bindings/riscv/cpus.yaml
Simple merge