hammer: fixed dma uniproc error
hammer: fixed dma uniproc error

Fixed an error reguarding DMA for uninprocessor systems.  Basically removed an
overly agressive optimization that lead to inconsistent state between the
cache and the directory.

sobercoder/gem5,qizenguf/MLC-STT,yb-kim/gemV,yb-kim/gemV,austinharris/gem5-riscv,qizenguf/MLC-STT,cancro7/gem5,rallylee/gem5,SanchayanMaity/gem5,markoshorro/gem5,HwisooSo/gemV-update,aclifton/cpeg853-gem5,rjschof/gem5,cancro7/gem5,kaiyuanl/gem5,SanchayanMaity/gem5,qizenguf/MLC-STT,aclifton/cpeg853-gem5,rallylee/gem5,rallylee/gem5,rjschof/gem5,joerocklin/gem5,samueldotj/TeeRISC-Simulator,rjschof/gem5,gedare/gem5,rjschof/gem5,austinharris/gem5-riscv,kaiyuanl/gem5,cancro7/gem5,gem5/gem5,TUD-OS/gem5-dtu,markoshorro/gem5,yb-kim/gemV,gem5/gem5,aclifton/cpeg853-gem5,zlfben/gem5,briancoutinho0905/2dsampling,qizenguf/MLC-STT,Weil0ng/gem5,sobercoder/gem5,rallylee/gem5,Weil0ng/gem5,samueldotj/TeeRISC-Simulator,TUD-OS/gem5-dtu,rallylee/gem5,qizenguf/MLC-STT,yb-kim/gemV,KuroeKurose/gem5,markoshorro/gem5,yb-kim/gemV,HwisooSo/gemV-update,cancro7/gem5,KuroeKurose/gem5,kaiyuanl/gem5,KuroeKurose/gem5,HwisooSo/gemV-update,powerjg/gem5-ci-test,samueldotj/TeeRISC-Simulator,austinharris/gem5-riscv,yb-kim/gemV,zlfben/gem5,SanchayanMaity/gem5,gedare/gem5,gedare/gem5,powerjg/gem5-ci-test,markoshorro/gem5,TUD-OS/gem5-dtu,gedare/gem5,samueldotj/TeeRISC-Simulator,markoshorro/gem5,cancro7/gem5,TUD-OS/gem5-dtu,samueldotj/TeeRISC-Simulator,powerjg/gem5-ci-test,SanchayanMaity/gem5,KuroeKurose/gem5,qizenguf/MLC-STT,zlfben/gem5,joerocklin/gem5,joerocklin/gem5,sobercoder/gem5,zlfben/gem5,zlfben/gem5,joerocklin/gem5,briancoutinho0905/2dsampling,aclifton/cpeg853-gem5,Weil0ng/gem5,cancro7/gem5,markoshorro/gem5,zlfben/gem5,SanchayanMaity/gem5,samueldotj/TeeRISC-Simulator,kaiyuanl/gem5,joerocklin/gem5,kaiyuanl/gem5,zlfben/gem5,briancoutinho0905/2dsampling,KuroeKurose/gem5,kaiyuanl/gem5,yb-kim/gemV,gedare/gem5,powerjg/gem5-ci-test,gem5/gem5,aclifton/cpeg853-gem5,gedare/gem5,TUD-OS/gem5-dtu,gedare/gem5,aclifton/cpeg853-gem5,Weil0ng/gem5,rallylee/gem5,markoshorro/gem5,powerjg/gem5-ci-test,austinharris/gem5-riscv,Weil0ng/gem5,gem5/gem5,TUD-OS/gem5-dtu,aclifton/cpeg853-gem5,austinharris/gem5-riscv,Weil0ng/gem5,joerocklin/gem5,KuroeKurose/gem5,austinharris/gem5-riscv,joerocklin/gem5,qizenguf/MLC-STT,cancro7/gem5,SanchayanMaity/gem5,samueldotj/TeeRISC-Simulator,rallylee/gem5,rjschof/gem5,gem5/gem5,sobercoder/gem5,sobercoder/gem5,austinharris/gem5-riscv,kaiyuanl/gem5,gem5/gem5,rjschof/gem5,yb-kim/gemV,KuroeKurose/gem5,briancoutinho0905/2dsampling,sobercoder/gem5,HwisooSo/gemV-update,rjschof/gem5,HwisooSo/gemV-update,sobercoder/gem5,joerocklin/gem5,briancoutinho0905/2dsampling,powerjg/gem5-ci-test,HwisooSo/gemV-update,briancoutinho0905/2dsampling,TUD-OS/gem5-dtu,Weil0ng/gem5,powerjg/gem5-ci-test,gem5/gem5,briancoutinho0905/2dsampling,HwisooSo/gemV-update,SanchayanMaity/gem5