dumpstate: refactor DumpUFS

The DumpUFS function cannot work with the real sepolicy rules. So
refactor the function to fix the problem.

Bug: 149468879
Test: run bugreport
Change-Id: I9b260d18f4cc768cba98b64d76a149241e17c22b
Signed-off-by: Leo Liou <leoliou@google.com>