arm64: dts: renesas: Add support for H3ULCB with R-Car H3e-2G

Add support for the Renesas R-Car Starter Kit Premier equipped with an
R-Car H3e-2G SiP.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/561a01ebeeef3f39f56cdc6ba8533bef222a72f2.1626708063.git.geert+renesas@glider.be