Basic support for the HiHope RZ/G2N main board:
  - Memory,
  - Main crystal,
  - Serial console
Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Link: https://lore.kernel.org/r/1568725530-55241-5-git-send-email-biju.das@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>