debuggerd.te: Fix relabelto policy denial

In 0c9708b2, we removed relabelto
from unconfined.te.  This broke debuggerd.  Fixed.

type=1400 audit(1373668537.550:5): avc:  denied  { relabelto } for  pid=44 comm="debuggerd" name="tombstones" dev="mtdblock1" ino=71 scontext=u:r:debuggerd:s0 tcontext=u:object_r:tombstone_data_file:s0 tclass=dir

Change-Id: Ic025cbc030d6e776d9d87b1df3240fdc5f0b53d5