Bump the timeout on IDumpstateDevice

We're seeing increasingly frequent timeouts due to what appears to be
organic growth in the amount data dumped. These timeouts severely
restrict our ability to triage certain kinds of bugs, so upping the
timeout here.

Bug: 223417101
Test: No timeouts seen locally.
Change-Id: I75aceef2eaa78e5e20f6f27e76b62131f781a14f