ARM: tegra: colibri_t30: annotate unused i2c busses

Both GEN2_I2C as well as CAM_I2C (I2C3) are unused in our design.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra30-colibri-eval-v3.dts

@@ -70,6 +70,10 @@ rtc@68 {
 		};
 	};
 
+	/* GEN2_I2C: unused */
+
+	/* CAM_I2C (I2C3): unused */
+
 	/* DDC_CLOCK/DATA on X3 pin 15/16 (e.g. display EDID) */
 	i2c@7000c700 {
 		status = "okay";