kbuild: builddeb: always make modules_install, to install modules.builtin*

Even for a non-modular kernel, the kernel builds modules.builtin and
modules.builtin.modinfo, with information about the built-in modules.
Tools such as initramfs-tools need these files to build a working
initramfs on some systems, such as those requiring firmware.

Now that `make modules_install` works even in non-modular kernels and
installs these files, unconditionally invoke it when building a Debian
package.
Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/package/builddeb

@@ -62,8 +62,8 @@ install_linux_image () {
 		${MAKE} -f ${srctree}/Makefile INSTALL_DTBS_PATH="${pdir}/usr/lib/linux-image-${KERNELRELEASE}" dtbs_install
 	fi
 
+	${MAKE} -f ${srctree}/Makefile INSTALL_MOD_PATH="${pdir}" modules_install
 	if is_enabled CONFIG_MODULES; then
-		${MAKE} -f ${srctree}/Makefile INSTALL_MOD_PATH="${pdir}" modules_install
 		rm -f "${pdir}/lib/modules/${KERNELRELEASE}/build"
 		rm -f "${pdir}/lib/modules/${KERNELRELEASE}/source"
 		if [ "${SRCARCH}" = um ] ; then