ARM: dts: imx: Migrate iMX6QDL picoITX DTs from Linux

Migrate DH picoITX device trees from Linux commit 42226c989789
(tag v5.18-rc7). No changes have been made, the DTs are exact copies.
Furthermore add the DTB to dh_imx6_defconfig.

Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Philip Oberfichtner <pro@denx.de>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index f82bf87..8187e6d 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -738,6 +738,7 @@
 	imx6dl-cubox-i-emmc-som-v15.dtb \
 	imx6dl-cubox-i-som-v15.dtb \
 	imx6dl-dhcom-pdk2.dtb \
+	imx6dl-dhcom-picoitx.dts \
 	imx6dl-gw51xx.dtb \
 	imx6dl-gw52xx.dtb \
 	imx6dl-gw53xx.dtb \