arm64: dts: imx8mp: Add support for DH electronics i.MX8M Plus DHCOM PicoITX

Add support for DH electronics i.MX8M Plus DHCOM SoM on PicoITX carrier board.
This system is populated with serial console, EQoS ethernet, eMMC, SD, SPI NOR,
LEDs and USB 3.0 host used in USB 2.0 mode on PicoITX.

Matching Linux kernel patch has been posted:
https://lore.kernel.org/imx/20240928234949.357893-2-marex@denx.de/

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index d46f0bd..b586e88 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -971,6 +971,7 @@
 	imx8mp-dhcom-pdk2.dtb \
 	imx8mp-dhcom-pdk3.dtb \
 	imx8mp-dhcom-pdk3-overlay-rev100.dtbo \
+	imx8mp-dhcom-picoitx.dtb \
 	imx8mp-icore-mx8mp-edimm2.2.dtb \
 	imx8mp-msc-sm2s.dtb \
 	imx8mq-pico-pi.dtb \