random: Remove unused SHA384 DRBGs.
* random/random-drbg.c (global): Remove unused SHA384-based defines. (drbg_cores): Remove SHA384 configurations. (drbg_sec_strength): Remove unused SHA384.
These are no longer allowed by FIPS and it looks like they were never
usable as they do not have any conversion from the string flags.
- GnuPG-bug-id: T6393
- Signed-off-by: Jakub Jelen <firstname.lastname@example.org>