This file is included automatically since quite some time now.
From documentation:
U-Boot automatically looks for and includes a file with updates
to the standard devicetree for your board, searching for them in
the same directory as the main file, in this order:
<orig_filename>-u-boot.dtsi
<CONFIG_SYS_SOC>-u-boot.dtsi
<CONFIG_SYS_CPU>-u-boot.dtsi
<CONFIG_SYS_VENDOR>-u-boot.dtsi
u-boot.dtsi
Signed-off-by: Andrejs Cainikovs <andrejs.cainikovs@toradex.com>
/dts-v1/;
#include "fsl-imx8qxp.dtsi"
-#include "fsl-imx8qxp-colibri-u-boot.dtsi"
/ {
model = "Toradex Colibri iMX8X";