trunks: set long reply timeout in dbus configuration

Set reply timeout in dbus for trunksd to 4 min. tpm_manager may
request to TakeOwnership, which may take 2-3 min. With default
dbus settings, tpm_manager gets a timeout while waiting on trunksd
to finish the operation.

BUG=chromium:623100
TEST=Boot on kevin, do "tpm_manager_client take_ownership"

Change-Id: I13861da82ea83ca1f87cd726a2084eb53429e294
Reviewed-on: https://chromium-review.googlesource.com/357920
Commit-Ready: Andrey Pronin <apronin@chromium.org>
Tested-by: Andrey Pronin <apronin@chromium.org>
Reviewed-by: Darren Krahn <dkrahn@chromium.org>
diff --git a/trunks/org.chromium.Trunks.conf b/trunks/org.chromium.Trunks.conf
index 9700dfb..bcf6388 100644
--- a/trunks/org.chromium.Trunks.conf
+++ b/trunks/org.chromium.Trunks.conf
@@ -12,4 +12,7 @@
     <deny send_destination="org.chromium.Trunks"
           send_interface="org.freedesktop.DBus.Introspectable" />
   </policy>
+
+  <!-- TODO: TEMP HACK: increase timeout to 4 min for TakeOwnership -->
+  <limit name="reply_timeout">240000</limit>
 </busconfig>