Bump luci percentage of android_arm64_dbg_recipe to 100.

https://chrome-internal-review.googlesource.com/608831
should give it enough bots to avoid serious pending times.

Will add more bots if needed.

TBR=jbudorick@chromium.org

Bug: 731962
Change-Id: I5dea57cd599d8f1b24192c458017509ad68d47f4
Reviewed-on: https://chromium-review.googlesource.com/1012597Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550700}

infra/config/branch/cq.cfg

@@ -50,7 +50,7 @@ verifiers {
       name: "master.tryserver.chromium.android"
       builders {
         name: "android_arm64_dbg_recipe"
-        equivalent_to { bucket: "luci.chromium.try" percentage: 50 }
+        equivalent_to { bucket: "luci.chromium.try" percentage: 100 }
       }
       builders {
         name: "android_clang_dbg_recipe"