ARM: pull in <asm/simd.h> from asm-generic

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
defconfig: enable ARM optimised AES and SHA1 routines + kernel mode NEON

Change-Id: I65cda6dae5ddddb961f303abfc444badabee1077
Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>