dscpPolicy: switch to bool

Bug: 361492282
Test: TreeHugger, atest CtsNetTestCases:android.net.cts.DscpPolicyTest
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I3bd83e19a814d811028f8bd60d3e0a794050338e
3 files changed