Do not change ownership of /sys/fs/selinux/load to system UID.

Policy reload is handled by setting the selinux.reload_policy property
and letting the init process perform the actual loading of policy into
the kernel.  Thus, there should be no need for the system UID to directly
write to /sys/fs/selinux/load.

Change-Id: I240c5bb2deaee757a2e1e396e14dea9e5d9286f5
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>