usb: Kconfig: config USB_XHCI_ROCKCHIP depends on DM_REGULATOR and DM_USB

The xhci-rockchip driver depends on DM_REGULATOR and DM_USB.
So add dependent features for xhci-rockchip driver in Kconfig.

Signed-off-by: Meng Dongyang <daniel.meng@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index b824eec..5e07a10 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -34,6 +34,8 @@
 config USB_XHCI_ROCKCHIP
 	bool "Support for Rockchip on-chip xHCI USB controller"
 	depends on ARCH_ROCKCHIP
+	depends on DM_REGULATOR
+	depends on DM_USB
 	default y
 	help
 	  Enables support for the on-chip xHCI controller on Rockchip SoCs.