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

Add support for the Renesas R-Car Starter Kit Premier and Kingfisher
combo 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/985ad56e9f93d08cf3d1014fbba86ea54beb01e1.1626708063.git.geert+renesas@glider.be