arch: riscv: pmp: reorder function definitions

Reorder the memory domain async functions to:
  arch_mem_domain_partition_add()
  arch_mem_domain_partition_remove()
  arch_mem_domain_thread_add()
  arch_mem_domain_thread_remove()

Signed-off-by: Jim Shu <cwshu@andestech.com>
1 file changed