copy dtb to /boot/dtb/

eclass/nas-kernel.eclass

@@ -618,6 +618,7 @@ _kernel_src_compile() {
 			popd
 			einfo "Append the device-tree-blob to the Kenel Image"
 			cat "${WORKDIR}"/boot/kernel-genkernel-${ARCH}-${KV_FULL} "${S}"/arch/arm/boot/${K_NASKERNEL_DTB} > zImage.new
+			cp "${S}"/arch/arm/boot/${K_NASKERNEL_DTB} "${WORKDIR}"/boot/dtb/
 			einfo "Create uImage of the resulting Image"
 			mkimage -A arm -O linux -T kernel -C none -a 0x00008000 -e 0x00008000 -n uImage-${KV_FULL} \
 				-d zImage.new "${WORKDIR}"/boot/uImage-genkernel-${ARCH}-${KV_FULL}