scd: Format change to specify "rsa2048" for KEY-ATTR.
* g10/card-util.c (do_change_keysize): Put "rsa". * scd/app-openpgp.c (change_keyattr, change_keyattr_from_string): Change the command format. (rsa_writekey): Check key type. (do_writekey): Remove "ecdh" and "ecdsa" support which was available in experimental libgcrypt before 1.6.0.