redhat/configs: automotive: Disable module signature with modules_install

JIRA: https://issues.redhat.com/browse/RHEL-78808

Upstream Status: https://gitlab.com/cki-project/kernel-ark.git

commit 9b1c1db88136a07bf5563b00c3a7be19debd0ca5
Author: Eric Chanudet <echanude@redhat.com>
Date:   Fri Jun 27 16:27:45 2025 -0400

    redhat/configs: automotive: Disable module signature with modules_install

    The specfile will, if requested by the rpmbuildopts, re-sign modules
    with mod-sign.sh anyway using the build key in __modsign_install_post
    before compressing them.

    Signed-off-by: Eric Chanudet <echanude@redhat.com>

Signed-off-by: Eric Chanudet <echanude@redhat.com>

Author: eric-ch

redhat/configs/rhel/automotive/generic/CONFIG_MODULE_SIG_ALL

@@ -0,0 +1 @@
+# CONFIG_MODULE_SIG_ALL is not set