Bugfixes for params to legacy control translations for EC parameters

Bugfixes for params to legacy control translations for EC parameters

param->ctrl translation: Fix fix_ecdh_cofactor()

In POST_PARAMS_TO_CTRL state the fix_ecdh_cofactor() function should
return value in ctx->p1

param->ctrl translation: fix evp_pkey_ctx_setget_params_to_ctrl
 return

Since some of the ctrl operations may return 0 as valid value
(e.g. ecdh_cofactor value 0 is valid setting), before colling
POST_PARAMS_TO_CTRL, we need to check return value for 0 as well
otherwise the evp_pkey_ctx_setget_params_to_ctrl function fails
without a chance to fix the return value

param->ctrl translation: Set ecdh_cofactor default action_type GET

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22587)

(cherry picked from commit 2aaef03339a88e5d693f278406a889657b10fd2d)