Enable crypto_unittests on Fuchsia/ARM64 bots.

Bug: 772031
Change-Id: I9aa7df5c39537b5866f3f35c4c1765f54dc2d7be
Reviewed-on: https://chromium-review.googlesource.com/744262
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Scott Graham <scottmg@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512644}

testing/buildbot/chromium.fyi.json

@@ -4128,7 +4128,6 @@
       "content_browsertests",
       "content_shell",
       "content_unittests",
-      "crypto_unittests",
       "gl_unittests",
       "headless_shell",
       "ipc_tests",
@@ -4152,6 +4151,12 @@
           "can_use_on_swarming_builders": true
         },
         "test": "base_unittests"
+      },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "crypto_unittests"
       }
     ]
   },