usb: ehci-mx6: Add fsl,imx7d-usb compatible string

Add new compatible string, used by some more up-to-date DTs.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Ye Li <ye.li@nxp.com>
Cc: uboot-imx <uboot-imx@nxp.com>
diff --git a/drivers/usb/host/ehci-mx6.c b/drivers/usb/host/ehci-mx6.c
index d3308c6..28db593 100644
--- a/drivers/usb/host/ehci-mx6.c
+++ b/drivers/usb/host/ehci-mx6.c
@@ -749,6 +749,7 @@
 
 static const struct udevice_id mx6_usb_ids[] = {
 	{ .compatible = "fsl,imx27-usb" },
+	{ .compatible = "fsl,imx7d-usb" },
 	{ }
 };