ARM: dts: renesas: genmai: Drop superfluous cells

ARM: dts: renesas: genmai: Drop superfluous cells

Drop superfluous address-cells and size-cells to fix DTC W=1 warning:

    arch/arm/boot/dts/renesas/r7s72100-genmai.dts:28.17-55.4: Warning (avoid_unnecessary_addr_size): /flash@18000000: unnecessary #address-cells/#size-cells without "ranges", "dma-ranges" or child "reg" or "ranges" property

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Fixes: 30e0a8cf886cb459 ("ARM: dts: renesas: genmai: Add FLASH nodes")
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260327234244.91707-6-marek.vasut+renesas@mailbox.org
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>