gadget: rockchip: Add rk3399 USB_GADGET_PRODUCT_NUM

Add 0x330c for rk3399 gadget product number.

Tested-by: Levin Du <djw@t-chip.com.cn>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 2da8b40..58ca82d 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -62,6 +62,7 @@
 	default 0x310c if ROCKCHIP_RK3128
 	default 0x320a if ROCKCHIP_RK3229 || ROCKCHIP_RK3288
 	default 0x330a if ROCKCHIP_RK3328
+	default 0x330c if ROCKCHIP_RK3399
 	default 0x0
 	help
 	  Product ID of the USB device emulated, reported to the host device.