Revert crypto: prng - Deterministic CPRNG

This patch is clearly not ready yet for prime time.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --cc crypto/Kconfig
Simple merge

diff --cc crypto/Makefile
Simple merge

diff --cc crypto/prng.c
Simple merge

diff --cc crypto/prng.h
Simple merge