TLS 1.2 has never been able to work with only SHA-512, it just happened
to pass previously because the declared dependencies were too lax.
(Probably related to the fact that in the past we didn't distinguish
between SHA-512 and SHA-384 in dependencies.)
So, just disable all of TLS in SHA-512-only builds. While at it, tune
build_info.h to make this easier - it already had partial support for
disabling TLS 1.2 or TLS 1.3 in an easier way, but not both of them at
the same time.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>