regulator: rzg2l-usbphy: Add new driver

Add a new regulator driver to control the USB VBUS supply on the Renesas
RZ/G2L and related SoCs.

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index 958f337..8f102a9 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -478,3 +478,11 @@
 	features for REGULATOR TPS65219 and the family of TPS65219 PMICs.
 	TPS65219 series of PMICs have 3 single phase BUCKs & 4 LDOs.
 	The driver implements get/set api for value and enable.
+
+config REGULATOR_RZG2L_USBPHY
+	bool "Enable driver for RZ/G2L USB PHY VBUS supply"
+	depends on DM_REGULATOR
+	help
+	  Enable this option to support controlling the VBUS supply in
+	  the USB PHY peripheral of the Renesas RZ/G2L SoC. This option
+	  is required in order to use the USB OTG port.