Multi-byte prefix cleanup
Multi-byte prefix cleanup

use the functions from address.c in ecdsa.c to avoid duplicated code.

runn1ng/trezor-crypto,trezor/trezor-crypto,trezor/trezor-crypto,jhoenicke/trezor-crypto,runn1ng/trezor-crypto,runn1ng/trezor-crypto,runn1ng/trezor-crypto,jhoenicke/trezor-crypto,trezor/trezor-crypto,trezor/trezor-crypto,jhoenicke/trezor-crypto,jhoenicke/trezor-crypto,trezor/trezor-crypto,jhoenicke/trezor-crypto,runn1ng/trezor-crypto