Revert "OS-8005 bhyve memory pressure needs to target ARC better (#354)"
This reverts commit a6033573eedd94118d2b9e65f45deca0bf4b42f7.

*** 194,205 ****
  int vm_service_mmio_read(struct vm *vm, int cpuid, uint64_t gpa, uint64_t *rval,
      int rsize);
  int vm_service_mmio_write(struct vm *vm, int cpuid, uint64_t gpa, uint64_t wval,
      int wsize);
  
- int vm_arc_resv(struct vm *vm, size_t);
- 
  #ifdef _SYS__CPUSET_H_
  cpuset_t vm_active_cpus(struct vm *vm);
  cpuset_t vm_debug_cpus(struct vm *vm);
  cpuset_t vm_suspended_cpus(struct vm *vm);
  #endif  /* _SYS__CPUSET_H_ */
--- 194,203 ----