crypto: exynos-rng - Remove exynos-rng driver

This driver has no purpose.  It doesn't feed into the Linux RNG, nor
does it implement the hwrng interface.  It is accessible only via the
"rng" algorithm type of AF_ALG, which isn't used in practice.  Everyone
uses either the Linux RNG, or rarely /dev/hwrng.

Moreover, this is a PRNG whose only source of entropy is the 160-bit
seed the user passes in.  So this can be used only by a user who already
has a source of cryptographically secure random numbers, such as
/dev/random.  Which they can, and do, just use in the first place.

Just remove this driver.  There's no need to keep useless code around.

Note that the other crypto_rng drivers in drivers/crypto/ are similarly
unused and are being removed too.  This commit just handles exynos-rng.

Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

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