ARM: Delete OABI syscall handling.
ARM: Delete OABI syscall handling.

We only support EABI binaries, so there is no reason to support OABI syscalls.
The loader detects OABI calls and fatal() so there is no reason to even check
here.

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