card: Display if KDF is enabled or not.
* g10/call-agent.h (kdf_do_enabled): New field. * g10/call-agent.c (learn_status_cb): Set kdf_do_enabled if available. * g10/card-util.c (current_card_status): Inform the availability.
Cherry pick of master commit: a5542a4a702c2210facf58a98bc8d3d16089b6ab
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>