Revert "SELinux:  Fix kernel BUG on empty security contexts."

This reverts commit 8ff4cc7d28bb468ce51fee865667bda7136d2577.
defconfig
Revert "SELinux: Enable setting security contexts on rootfs inodes."

This reverts commit 4d24443b6a16a9d873aaeeed08c5156743521770.
Revert "SELinux: Reduce overhead of mls_level_isvalid() function call"

This reverts commit a318b117ea6cb92a5fdea400f214fd4647261af1.
make selinux permissive