refactored old buggy VCH writeback to VCC
refactored old buggy VCH writeback to VCC

8l/rsp,8l/rsp,mupen64plus/mupen64plus-rsp-cxd4,8l/rsp,mupen64plus/mupen64plus-rsp-cxd4,mupen64plus/mupen64plus-rsp-cxd4