add f9 slot for attestation

tool/cmdline.ggo

@@ -36,7 +36,7 @@ option "action" a "Action to take" values="version","generate","set-mgm-key",
 text   "
        Multiple actions may be given at once and will be executed in order
        for example --action=verify-pin --action=request-certificate\n"
-option "slot" s "What key slot to operate on" values="9a","9c","9d","9e","82","83","84","85","86","87","88","89","8a","8b","8c","8d","8e","8f","90","91","92","93","94","95" enum optional
+option "slot" s "What key slot to operate on" values="9a","9c","9d","9e","82","83","84","85","86","87","88","89","8a","8b","8c","8d","8e","8f","90","91","92","93","94","95","f9" enum optional
 text   "
        9a is for PIV Authentication
        9c is for Digital Signature (PIN always checked)

tool/util.c

@@ -262,6 +262,9 @@ int get_object_id(enum enum_slot slot) {
     case slot_arg_95:
       object = YKPIV_OBJ_RETIRED20;
       break;
+    case slot_arg_f9:
+      object = YKPIV_OBJ_ATTESTATION;
+      break;
     case slot__NULL:
     default:
       object = 0;