arm64: dts: colibri-imx8x: Cleanup comments

Remove unnecessary comments. The Colibri-iMX8X doesn't support FlexCAN,
and the GPU is already enabled in the SOC dtsi.

Signed-off-by: João Paulo Gonçalves <joao.goncalves@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8x-colibri.dtsi

@@ -121,10 +121,6 @@
 			     "enet0_lpcg_ipg_s_clk";
 };
 
-/* TODO flexcan1 - 3 */
-
-/* TODO GPU */
-
 /* On-module I2C */
 &i2c0 {
 	#address-cells = <1>;