Increasing TombstoneSection timeout to 2 minutes.

Java trace dumps can take significantly longer than 30 seconds. Testing
suggests that 2 minutes should be ample time.

Bug: 111729299
Test: 'adb shell incident' and ensure the section doesn't time out.
Change-Id: I35e09fc1ca608122a1a352985ea3741f6ea0a344
(cherry picked from commit 0f716794)