Add property to force restorecon to run.

As an optimization, we typically only run restorecon when
seapp_contexts changes.  This CL checks a property that can be used
to always force a restorecon to help investigate boot timing.

Bug: 30213213
Change-Id: I4d65c1a4e4a0830ef4a32cd2fae1d3ab188b65cc
1 file changed