s390x: Return condition code of kdsa instruction

s390x: Return condition code of kdsa instruction

The kdsa instruction is doing some parameter checking for the verify
function codes, like r/s equals zero and range checks. To handle these
cases correctly in the calling functions, the asm returns now also
condition code 2.

Signed-off-by: Holger Dengler <dengler@linux.ibm.com>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/29214)