Remove unused static variable sha384_initial_hash_value.
Remove unused static variable sha384_initial_hash_value.

trezor/trezor-crypto,romanz/trezor-crypto,jhoenicke/trezor-crypto,01BTC10/trezor-crypto,trezor/trezor-crypto,trezor/trezor-crypto,romanz/trezor-crypto,trezor/trezor-crypto,trezor/trezor-crypto,01BTC10/trezor-crypto,runn1ng/trezor-crypto,runn1ng/trezor-crypto,romanz/trezor-crypto,runn1ng/trezor-crypto,jhoenicke/trezor-crypto,jhoenicke/trezor-crypto,romanz/trezor-crypto,runn1ng/trezor-crypto,01BTC10/trezor-crypto,jhoenicke/trezor-crypto,runn1ng/trezor-crypto,jhoenicke/trezor-crypto,romanz/trezor-crypto