ARM: move AES typedefs and function prototypes to separate header

Put the struct definitions for AES keys and the asm function prototypes in a
separate header and export the asm functions from the module.
This allows other drivers to use them directly.

Change-Id: I8e0f1825b018f494ff6130e0cc04b7b6c5020a0b
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Git-commit: 7e168319a52d9c0a4871a1c5a2f4be975550852a
Git-repo: https://android.googlesource.com/kernel/common/


Signed-off-by: Samir Mehta <samirn@codeaurora.org>