config: disable SECURITY_DMESG_RESTRICT (bsc#1157066)
    
    Enabling this option which restricts access to dmesg was not intentional
    and happened accidentally as part of a commit aiming to enable features
    which were enabled in SLE. We might restrict dmesg in the future if there
    is a consensus but for now the proper action is to revert this accidental
    change which only affected some architectures anyway.