ARM: tegra: colibri_t30: annotate ehci instance 1

Annotate EHCI instance 1 (USB2_DP/N) connecting to ASIX AX88772B USB to
Ethernet chip being on-module.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra30-colibri.dtsi

@@ -939,7 +939,7 @@ sdhci@78000600 {
 		mmc-ddr-1_8v;
 	};
 
-	/* EHCI instance 1: USB2_DP/N -> AX88772B */
+	/* EHCI instance 1: USB2_DP/N -> AX88772B (On-module) */
 	usb@7d004000 {
 		status = "okay";
 		#address-cells = <1>;