arm64: dts: renesas: v3msk: add SCIF0 pins

Add the (previously omitted) SCIF0 pin data to the V3M Starter Kit board's
device tree.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>