hw18: dtb: Create symlink with name nbhw18

The board descriptor reference the devicetree as ..nbhw18..
And by now the actual name of the devicetree is ..nrhw18..

This symlink is needed to keep the compatiblity with NBSW

recipes-kernel/linux/linux-netmodule_git.bb

@@ -42,3 +42,6 @@ do_install_append(){
     cp Module.symvers ${STAGING_KERNEL_BUILDDIR}/
 }
 
+do_install_append_armada-385-nrhw18() {
+    ln -s devicetree-${DTB_SYMLINK_NAME}.dtb ${D}/${KERNEL_IMAGEDEST}/armada-385-nbhw18-prod4.dtb
+}