arm64: dts: renesas: r8a77995: Add SCIF {0,1,3,4,5} and all HSCIF device nodes

This patch adds the device nodes for SCIF {0,1,3,4,5} and all HSCIF serial
ports, incl. clocks, power domain and DMAs.

Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com>
Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>