Sepolicy load: use -N flag to skip neverallow checks

Fixes issue where attributes used exclusively in neverallow
rules were removed from policy.

Bug: 37357742
Test: Force on-device compile by removing precompiled policy.
      Verify no increase in compile time.

Change-Id: I0d145fd311c2ddcb226a827f2a997f10c20a8379
1 file changed