fix reference to sysctl variable: machdep.an_cache_mode -> hw.an.an_cache_mode
fix reference to sysctl variable: machdep.an_cache_mode -> hw.an.an_cache_mode

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase