Revert crypto: fips - Select CPRNG

This reverts commit 215ccd6f.

It causes CPRNG and everything selected by it to be built-in
whenever FIPS is enabled.  The problem is that it is selecting
a tristate from a bool, which is usually not what is intended.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/Kconfig

@@ -23,7 +23,6 @@ comment "Crypto core or helper"
 
 config CRYPTO_FIPS
 	bool "FIPS 200 compliance"
-	select CRYPTO_ANSI_CPRNG
 	help
 	  This options enables the fips boot option which is
 	  required if you want to system to operate in a FIPS 200