pubkey: Move sexp parsing for gcry_pk_get_nbits to the modules.
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pubkey: Move sexp parsing for gcry_pk_get_nbits to the modules.

* cipher/pubkey.c (spec_from_sexp): New.
(gcry_pk_get_nbits): Simplify.
* cipher/rsa.c (rsa_get_nbits): Take only PARMS as args and do sexp
parsing here.
* cipher/dsa.c (dsa_get_nbits): Ditto.
* cipher/elgamal.c (elg_get_nbits): Ditto.
* cipher/ecc.c (ecc_get_nbits): Ditto.
* cipher/ecc-curves.c (_gcry_ecc_fill_in_curve): Allow NULL for arg
CURVE.

gcry_pk_get_nbits should now also be faster for ECC because there is
no more need to copy all the parms if a curve name has been given.