crypto: fips - Depend on CRYPTO_DRBG=y

Currently, the callers of crypto_stdrng_get_bytes() do 'select
CRYPTO_RNG_DEFAULT', which does 'select CRYPTO_DRBG_MENU'.

However, due to the change in how crypto_stdrng_get_bytes() is
implemented, CRYPTO_DRBG_MENU is now needed only when CRYPTO_FIPS.

But, 'select CRYPTO_DRBG_MENU if CRYPTO_FIPS' would cause a recursive
dependency, since CRYPTO_FIPS 'depends on CRYPTO_DRBG'.

Solve this by just making CRYPTO_FIPS depend on CRYPTO_DRBG=y (rather
than CRYPTO_DRBG i.e. CRYPTO_DRBG=y || CRYPTO_DRBG=m).  The distros that
use CRYPTO_FIPS=y already set CRYPTO_DRBG=y anyway, which makes sense.

This makes the CRYPTO_RNG_DEFAULT symbol (and its corresponding
selection of CRYPTO_DRBG_MENU) unnecessary.  A later commit removes it.

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

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