Revert "."

This reverts commit edca217b276e71c2e30a699241c1dc10b1ded883.
arm: remove stale export of 'sha_transform'

The generic library code already exports the generic function, this was
left-over from the ARM-specific version that just got removed.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>