[MB] Migrate two clusterfuzz bots to new waterfall

NOTRY=true
NOTREECHECKS=true
TBR=tandrii@chromium.org,kjellander@chromium.org

Bug: chromium:726584
Change-Id: I3bf3587e2d58c34b5697785c6033d28eb584146d
Reviewed-on: https://chromium-review.googlesource.com/522126
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45676}

infra/mb/mb_config.pyl

@@ -100,9 +100,11 @@
       'V8 Linux - interpreted regexp': 'gn_release_x86_interpreted_regexp',
       'V8 Random Deopt Fuzzer - debug': 'gyp_debug_x86',
     },
-    'client.v8.fyi': {
+    'client.v8.clusterfuzz': {
       'V8 Linux64 - release builder': 'gn_release_x64_correctness_fuzzer',
       'V8 Linux64 - debug builder': 'gn_debug_x64',
+    },
+    'client.v8.fyi': {
       'V8 Linux64 ASAN no inline - release builder':
           'gn_release_x64_asan_symbolized_edge_verify_heap',
       'V8 Linux64 ASAN - debug builder': 'gn_debug_x64_asan_edge',