RISC-V: resort all extensions in consistent orders

Ordering between each and every list of extensions is wildly
inconsistent. Per discussion on the lists pick the following policy:

- The array defining order in /proc/cpuinfo follows a narrow
  interpretation of the ISA specifications, described in a comment
  immediately presiding it.

- All other lists of extensions are sorted alphabetically.

This will hopefully allow for easier review & future additions, and
reduce conflicts between patchsets as the number of extensions grows.

Link: https://lore.kernel.org/all/[email protected]/
Suggested-by: Andrew Jones <[email protected]>
Reviewed-by: Andrew Jones <[email protected]>
Reviewed-by: Heiko Stuebner <[email protected]>
Signed-off-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

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