cpu: Remove unused getBranchPred() method from BaseCPU
cpu: Remove unused getBranchPred() method from BaseCPU

Remove unused virtual getBranchPred() method from BaseCPU as it is not
implemented by any of the CPU models. It used to always return NULL.

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