ARM: dts: r8a7744: Add [H]SCIF{A|B} support

Describe [H]SCIF{|A|B} ports in the R8A7744 device tree.

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>