crypto: arm/aes-cipher - move S-box to .rodata section

Move the AES inverse S-box to the .rodata section
where it is safe from abuse by speculation.

Signed-off-by: Jinbum Park <jinb.park7@gmail.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>