selinux: Relocate ss_initialized and selinux_enforcing to separate 4k

We need to relocate ss_initialized and selinux_enforcing to a separate
4k page to enable EL2 Hypervisor to monitor changes to this variable
using ARM stage 2 MMU. We will avoid getting page faults from
un-related data as the MMU granularity is configured to 4k.

Change-Id: I870b50edf1a5d3e3b89d249a2eaac6ab6f3838ee
Signed-off-by: Amareswar Reddy Valasa <avalasa@codeaurora.org>