regulator: renesas-usb-vbus-regulator: Update the default

As the "rzg2l-usb-vbus-regulator" platform device is only created by
drivers/reset/reset-rzg2l-usbphy-ctrl.c, update the default stricter by
replacing ARCH_RZG2L->RESET_RZG2L_USBPHY_CTRL.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Closes: https://lore.kernel.org/all/CAMuHMdX5ayWbLEEa6nAipECVB6H9eCpRg21pu3zYrTdiER0F+Q@mail.gmail.com/
Link: https://patch.msgid.link/20240715134120.312610-1-biju.das.jz@bp.renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/Kconfig

@@ -1639,7 +1639,7 @@ config REGULATOR_RZG2L_VBCTRL
 	depends on ARCH_RZG2L || COMPILE_TEST
 	depends on OF
 	select REGMAP_MMIO
-	default ARCH_RZG2L
+	default RESET_RZG2L_USBPHY_CTRL
 	help
 	  Support for VBUS regulators implemented on Renesas RZ/G2L SoCs.