Switch fuchsia builders to use CIPD recipes

TBR=jbudorick@chromium.org, tandrii@chromium.org

Bug: 811974
Change-Id: I1cbeab2333cd9a243177cf9a4e1d1bd73b1efc19
Reviewed-on: https://chromium-review.googlesource.com/959745Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542704}

infra/config/global/cr-buildbucket.cfg

@@ -436,21 +436,25 @@ buckets {
     builders {
       name: "Fuchsia ARM64"
       mixins: "linux-ci"
+      mixins: "cipd recipes"
     }
 
     builders {
       name: "Fuchsia ARM64 Cast Audio"
       mixins: "linux-ci"
+      mixins: "cipd recipes"
     }
 
     builders {
       name: "Fuchsia x64"
       mixins: "linux-ci"
+      mixins: "cipd recipes"
     }
 
     builders {
       name: "Fuchsia x64 Cast Audio"
       mixins: "linux-ci"
+      mixins: "cipd recipes"
     }
 
     # Linux bots.
@@ -904,7 +908,7 @@ buckets {
       }
     }
     builders { mixins: "linux-try" name: "closure_compilation" }
-    builders { mixins: "linux-try" name: "fuchsia" }
+    builders { mixins: "linux-try" mixins: "cipd recipes" name: "fuchsia" }
     builders { mixins: "linux-try" name: "linux_android_rel_ng" }
     builders { mixins: "linux-angle-try" name: "linux_angle_compile_dbg_ng" }
     builders { mixins: "linux-angle-try" name: "linux_angle_dbg_ng" }