arm64: dts: renesas: r8a77965: Add all HSCIF nodes

Based on a similar patch of the R8A7796 device tree
by Ulrich Hecht <ulrich.hecht+renesas@gmail.com>.

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