BACKPORT: lib/crypto: add prompts back to crypto libraries

Commit 6048fdcc5f269 ("lib/crypto: blake2s: include as built-in") took
away a number of prompt texts from other crypto libraries. This makes
values flip from built-in to module when oldconfig runs, and causes
problems when these crypto libs need to be built in for thingslike
BIG_KEYS.

Fixes: 6048fdcc5f269 ("lib/crypto: blake2s: include as built-in")
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: linux-crypto@vger.kernel.org
Signed-off-by: Justin M. Forbes <jforbes@fedoraproject.org>
[Jason: - moved menu into submenu of lib/ instead of root menu
        - fixed chacha sub-dependencies for CONFIG_CRYPTO]
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

(cherry picked from commit e56e18985596617ae426ed5997fb2e737cffb58b)

Conflicts:
	lib/Kconfig
	lib/crypto/Kconfig

Change-Id: Ic152f89df593925e9467ca16ee98ff2750ee6dea
Signed-off-by: Eric Biggers <ebiggers@google.com>