crypto: omap - add omap_aes_unregister_algs helper

crypto: omap - add omap_aes_unregister_algs helper

Add a new helper omap_aes_unregister_algs() and replace two for loops in
omap_aes_probe() and omap_aes_remove(), which also ensure ->registered
is reset to 0.

Replace two additional for loops with crypto_engine_unregister_aeads()
while at it and reset ->registered to 0 explicitly.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>