arm64: dts: r8a7795: h3ulcb: Add support for R-Car H3 ES2.0

Split off support for H3ULCB boards with the ES1.x revision of the R-Car
H3 SoC into a separate file.  The main r8a7795-h3ulcb.dts file now
corresponds to H3ULCB with R-Car H3 ES2.0 or later.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>