arm64: rename enum arm64_mrs_reg to arm64_sysreg
arm64: rename enum arm64_mrs_reg to arm64_sysreg

bSr43/capstone,bSr43/capstone,AmesianX/capstone,AmesianX/capstone,AmesianX/capstone,AmesianX/capstone,bSr43/capstone,bSr43/capstone,bSr43/capstone,bSr43/capstone,bSr43/capstone,AmesianX/capstone,AmesianX/capstone,AmesianX/capstone