async hash & hmac

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Hello,

When allocating hmac like: crypto_alloc_ahash("hmac(sha1)", ..),
it is actually fallsback to  "shash" hmac and software shash hash
implementation..
Even when HW accelerator provides AHASH it will not be used with hmac.

Basically HW driver needs to provide its own implementation for async
hmac, like I did for omap-sham.

		.cra_name		= "hmac(sha1)",
		.cra_driver_name	= "omap-hmac-sha1",

Is that correct, right?

Thanks.

- Dmitry
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