Add support for SVE2 and add to 8-2a, as it can be used there.
Also, clean up the comments
(From OE-Core rev: 683443d57cb18b3b54245b1a09b6e5d2bae4f5d0)
Signed-off-by: Jon Mason <jon.mason@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>