usb: dwc3-generic: add support for exynos7870

Exynos7870's DWC3 glue layer is quite simple, consisting of a few
clocks, which is handled by this driver. Add the compatible string in
here.

Reviewed-by: Marek Vasut <marek.vasut@mailbox.org>
Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>

drivers/usb/dwc3/dwc3-generic.c

@@ -711,6 +711,7 @@ static const struct udevice_id dwc3_glue_ids[] = {
 	{ .compatible = "fsl,imx8mp-dwc3", .data = (ulong)&imx8mp_ops },
 	{ .compatible = "fsl,imx8mq-dwc3" },
 	{ .compatible = "intel,tangier-dwc3" },
+	{ .compatible = "samsung,exynos7870-dwusb3" },
 	{ .compatible = "samsung,exynos850-dwusb3" },
 	{ }
 };