Function zx_vmar_allocate

pub unsafe extern "C" fn zx_vmar_allocate(
    parent_vmar: zx_handle_t,
    options: zx_vm_option_t,
    offset: usize,
    size: usize,
    child_vmar: *mut zx_handle_t,
    child_addr: *mut zx_vaddr_t,
) -> zx_status_t