ARM: dts: stm32: Add DHCOM based PicoITX board

Add DT for DH PicoITX unit, which is a bare-bones carrier board for
the DHCOM. The board has ethernet port, USB, CAN, LEDs and a custom
board-to-board expansion connector.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 7d1a369..e2e8a5f 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -965,6 +965,7 @@
 	stm32mp157c-odyssey.dtb \
 	stm32mp15xx-dhcom-drc02.dtb \
 	stm32mp15xx-dhcom-pdk2.dtb \
+	stm32mp15xx-dhcom-picoitx.dtb \
 	stm32mp15xx-dhcor-avenger96.dtb
 
 dtb-$(CONFIG_SOC_K3_AM6) += k3-am654-base-board.dtb k3-am654-r5-base-board.dtb