arm64: dts: renesas: Add HiHope RZ/G2M[N] Rev.3.0/4.0 specific into common file

Rev.3.0 and Rev.4.0 are identical and can be identified by using GP5_19
and GP5_21.

	Rev		GP5_19	GP5_21
	==============================
	Rev.3.0		0	0
	Rev.4.0		0	1

This patch creates hihope-rev4.dtsi file with
Rev.3.0/4.0 specific changes for HopeRun HiHope RZ/G2M[N] boards.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Marian-Cristian Rotariu <marian-cristian.rotariu.rb@bp.renesas.com>
Link: https://lore.kernel.org/r/1593004330-5039-5-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>