arm64: dts: renesas: rz-smarc: Replace fixed regulator for USB VBUS

Replace the fixed regulator for USB VBUS and use the proper one that
controls regulator based on VBUS detection.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20240702180032.207275-5-biju.das.jz@bp.renesas.com


Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>