Use armv8 instructions to optimize ARM32 crypto

[hong-rong hsu]

Hi,

We are engineers from Mediatek. We have a patch to optimize ARM32 kernel
crypto performance by armv8 instructions. Do you have interest in it?

It may be helpful for some projects which running 32-bit kernel at
armv8. Do you suggest that we maintain it at the main-stream :-)? (ex.
add aes-armv8.S in arch/arm/crypto/ folder)

Thanks.