arm64: dts: renesas: r8a774b1: Add SCIF and HSCIF nodes

Add the device nodes for RZ/G2N SCIF and HSCIF serial ports,
including clocks, power domains and DMAs.

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Link: https://lore.kernel.org/r/1569831527-1250-3-git-send-email-biju.das@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>