Add the initial  device tree for the R8A7745 SoC based SK-RZG1E board.
The board has 1  debug  serial  port (SCIF2); include support for it,
so that the serial console can  work.

Based on the original (and large) patch by Dmitry Shifrin
<dmitry.shifrin@cogentembedded.com>.
Signed-off-by: NSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>