Allow dumpstate to read the update_engine logs

Denial message:
avc: denied { read } for pid=2775 comm="dumpstate" name="update_engine_log"
dev="sda35" ino=3850274 scontext=u:r:dumpstate:s0
tcontext=u:object_r:update_engine_log_data_file:s0 tclass=dir permissive=0

Bug: 78201703
Test: take a bugreport
Change-Id: I2c788c1211812aa0fcf58cee37a6e8f955424849