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>
Signed-off-by: flar2 <asegaert@gmail.com>

Conflicts:
	arch/arm/kernel/armksyms.c

Change-Id: I550a79d513e96b987667d30bf30b23dc67debcf9