arm64: dts: ulcb-kf: initial device tree

Add the initial common dtsi file for Kingfisher infotainment board (R-Car
Starter Kit extension)

This commit supports the following peripherals:
- HSCIF0

Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>