Release riscv-isa-release-e867a4e-2024-09-24

This release was created by: wmat
Release of RISC-V ISA, built from commit e867a4e, is now available.

What's Changed

• Adds back bits 57 & 56 by @wmat in #1645

Full Changelog: riscv-isa-release-1745bbf-2024-09-23...riscv-isa-release-e867a4e-2024-09-24