board/zynq/post-image.sh: support linux 6.6 dts directory structure

Linux 6.6 includes a xilinx directory in the dts directory structure for zynq
boards.  This patch updates the post-image.sh to match the zynqmp post-image.sh
in order to support this change.

Signed-off-by: Neal Frager <neal.frager@amd.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

board/zynq/post-image.sh

@@ -4,9 +4,9 @@
 # let's use a symlink with that name that points to the *first*
 # devicetree listed in the config.
 
-FIRST_DT=$(sed -n \
-           's/^BR2_LINUX_KERNEL_INTREE_DTS_NAME="\([a-z0-9\-]*\).*"$/\1/p' \
-           "${BR2_CONFIG}")
+FIRST_DT=$(sed -nr \
+               -e 's|^BR2_LINUX_KERNEL_INTREE_DTS_NAME="(xilinx/)?([-_/[:alnum:]\\.]*).*"$|\2|p' \
+               "${BR2_CONFIG}")
 
 [ -z "${FIRST_DT}" ] || ln -fs "${FIRST_DT}.dtb" "${BINARIES_DIR}/system.dtb"