Mojo Android bot: Increase hard timeout for swarm configuration.

Currently Mojo Android bot can compile but will timeout during
StartInstrumentation. This CL increases hard timeout for the swarm
to wait longer.

Failed bot log is here:
https://logs.chromium.org/v/?s=chromium%2Fbb%2Ftryserver.chromium.android%2Fandroid_mojo%2F19%2F%2B%2Frecipes%2Fsteps%2Fnetwork_service_content_browsertests__with_patch__on_Android%2F0%2Fstdout


Bug: 783374
Change-Id: I153fa452e579aa5d4b3247e779756c89b929a692
Reviewed-on: https://chromium-review.googlesource.com/893902Reviewed-by: Benjamin Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533174}

testing/buildbot/chromium.fyi.json

@@ -4704,7 +4704,7 @@
               "device_type": "bullhead"
             }
           ],
-          "hard_timeout": 960,
+          "hard_timeout": 1800,
           "output_links": [
             {
               "link": [

testing/buildbot/waterfalls.pyl

@@ -1095,7 +1095,7 @@
               'device_type': 'bullhead',
             },
           ],
-          'hard_timeout': 960,
+          'hard_timeout': 1800,
         },
         'os_type': 'android',
         'test_suites': {