ANDROID: crypto: aesni: fix function types for aesni_(enc|dec)

Use a prototype that matches the function pointer type to avoid CFI
failures.

Bug: 145297900
Change-Id: I64ac0a4c80e499b74e6416ce6d015f1afc4f0373
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>