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

*** 1940,1957 ****
          }
  
          return (0);
  }
  
- int
- vm_arc_resv(struct vmctx *ctx, size_t len)
- {
-         if (ioctl(ctx->fd, VM_ARC_RESV, (uint64_t)len) != 0) {
-                 return (errno);
-         }
-         return (0);
- }
  #endif /* __FreeBSD__ */
  
  #ifdef __FreeBSD__
  const cap_ioctl_t *
  vm_get_ioctls(size_t *len)
--- 1940,1949 ----