Add a minimal device node for the Bus State Controller (BSC) on the
RZ/A1H SoC, to be extended by board DTS files for devices residing in
the BSC external address space.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/ccab4fa198225edcd3750f62532a1ee3c6d2a109.1693481518.git.geert+renesas@glider.be