Trigger a policy reload from post-fs-data.

Once userdata is available and decrypted, trigger a policy reload to pick
up any policy update files stored under /data/security.

Change-Id: Ic2b3121c3395429b108c40d1d7f5a3124a5896c5
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>