Remove the psa-crypto-conversions feature from the cryptoki dependency in the Cargo.toml file. The psa-crypto crate is already being brought up in the Cargo.toml file and this would have lead to a crate conflict when upgrading.
Remove parsec's dependency on cryptoki's psa-crypto by creating helping functions to perform type conversions.
Signed-off-by: Tomás González tomasagustin.gonzalezorlando@arm.com