Calculate OCB L-tables when setting key instead of when setting nonce
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Description

Calculate OCB L-tables when setting key instead of when setting nonce

* cipher/cipher-internal.h (gcry_cipher_handle): Mark areas of
u_mode.ocb that are and are not cleared by gcry_cipher_reset.
(_gcry_cipher_ocb_setkey): New.
* cipher/cipher-ocb.c (_gcry_cipher_ocb_set_nonce): Split
L-table generation to ...
(_gcry_cipher_ocb_setkey): ... this new function.
* cipher/cipher.c (cipher_setkey): Add handling for OCB mode.
(cipher_reset): Do not clear L-values for OCB mode.

OCB L-tables do not depend on nonce value, but only on cipher key.