UPSTREAM: blk-crypto: export wrapped key functions

Export blk_crypto_derive_sw_secret(), blk_crypto_import_key(),
blk_crypto_generate_key(), and blk_crypto_prepare_key() so that they can
be used by device-mapper when passing through wrapped key support.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

(cherry picked from commit 025e138e)
Bug: 160883801
Change-Id: I2a5d11b8ec809a0c4119cd5080b4d62e477ff845
Signed-off-by: Eric Biggers <ebiggers@google.com>