pallet-revive: EXTCODEHASH to match EIP-1052 (#6088)

# Description
Update `ext_code_hash` to match
[EIP-1052](https://eips.ethereum.org/EIPS/eip-1052) specs. Since all
possible results are written into output pointer then there's no need
for a return value.

https://github.com/paritytech/revive/pull/77