kbuild: buildtar: add dtbs support

Make 'make tar-pkg' install dtbs.
Signed-off-by: NDomenico Andreoli <domenico.andreoli@linux.com>
Signed-off-by: NMasahiro Yamada <masahiroy@kernel.org>

scripts/package/buildtar

@@ -53,6 +53,18 @@ rm -rf -- "${tmpdir}"
 mkdir -p -- "${tmpdir}/boot"
 dirs=boot
 
+
+#
+# Try to install dtbs
+#
+if grep -q '^CONFIG_OF_EARLY_FLATTREE=y' include/config/auto.conf; then
+	# Only some architectures with OF support have this target
+	if [ -d "${srctree}/arch/${SRCARCH}/boot/dts" ]; then
+		$MAKE ARCH="${ARCH}" -f ${srctree}/Makefile INSTALL_DTBS_PATH="${tmpdir}/boot/dtbs/${KERNELRELEASE}" dtbs_install
+    fi
+fi
+
+
 #
 # Try to install modules
 #