Ramp fuchsia_x64 to 100% LUCI equivalence.

TBR=tandrii@google.com

Bug: 776496
Change-Id: Ibca4e9ee732042e95fa10843f79d44c099bbaab9
Reviewed-on: https://chromium-review.googlesource.com/1010799Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551338}

infra/config/branch/cq.cfg

@@ -90,7 +90,7 @@ verifiers {
       name: "master.tryserver.chromium.linux"
       builders {
         name: "fuchsia_x64"
-        equivalent_to { bucket: "luci.chromium.try" percentage: 10 }
+        equivalent_to { bucket: "luci.chromium.try" percentage: 100 }
       }
       builders {
         name: "linux_chromium_asan_rel_ng"