[LUCI] Fix master name for chromium.android.fyi testers.

Bug: 837790
Change-Id: I8d1b8d1bebea194021d4473a960fdf7529e5e571
Reviewed-on: https://chromium-review.googlesource.com/1040774Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Zhiling Huang <hzl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555599}

infra/config/global/cr-buildbucket.cfg

@@ -119,6 +119,13 @@ builder_mixins {
   }
 }
 
+builder_mixins {
+  name: "android-fyi-ci"
+  recipe {
+    properties: "mastername:chromium.android.fyi"
+  }
+}
+
 builder_mixins {
   name: "android-angle-try"
   dimensions: "os:Ubuntu-14.04"
@@ -495,13 +502,13 @@ buckets {
 
     builders {
       name: "Android Tests (trial)(dbg)"
-      mixins: "android-ci"
+      mixins: "android-fyi-ci"
       dimensions: "os:Ubuntu-14.04"
     }
 
     builders {
       name: "Android Tests with Tracing"
-      mixins: "android-ci"
+      mixins: "android-fyi-ci"
       dimensions: "os:Ubuntu-14.04"
     }
 
@@ -560,7 +567,7 @@ buckets {
 
     builders {
       name: "Jelly Bean Tester"
-      mixins: "android-ci"
+      mixins: "android-fyi-ci"
       dimensions: "os:Ubuntu-14.04"
     }
 
@@ -578,7 +585,7 @@ buckets {
 
     builders {
       name: "Lollipop Low-end Tester"
-      mixins: "android-ci"
+      mixins: "android-fyi-ci"
       dimensions: "os:Ubuntu-14.04"
     }