Revert "Temporarily remove iOS bot from CQ."

This reverts commit 3a2cb1accd51e85e19fd672a793296239e9913e3.

Reason for revert: skia:8013 has been resolved

Original change's description:
> Temporarily remove iOS bot from CQ.
> 
> Bug: skia:8013
> No-Try: true
> Change-Id: I2a377a6249366ed947bba50fe89ac218e5e3c87c
> Reviewed-on: https://skia-review.googlesource.com/130060
> Reviewed-by: Ben Wagner <benjaminwagner@google.com>
> Commit-Queue: Ben Wagner <benjaminwagner@google.com>

TBR=benjaminwagner@google.com,herb@google.com

Change-Id: I8e734415b05c2951508b5c9a763c098696365a91
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:8013
Reviewed-on: https://skia-review.googlesource.com/130180
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
diff --git a/infra/branch-config/cq.cfg b/infra/branch-config/cq.cfg
index 5f40dbd..262492b 100644
--- a/infra/branch-config/cq.cfg
+++ b/infra/branch-config/cq.cfg
@@ -54,8 +54,7 @@
       builders { name: "Test-Ubuntu17-Clang-Golo-GPU-QuadroP400-x86_64-Release-All" }
       builders { name: "Test-Win10-Clang-NUC6i5SYK-GPU-IntelIris540-x86_64-Debug-All" }
       builders { name: "Test-Win2016-Clang-GCE-CPU-AVX2-x86_64-Release-All" }
-      # skia:8013
-      #builders { name: "Test-iOS-Clang-iPhone7-GPU-GT7600-arm64-Debug-All" }
+      builders { name: "Test-iOS-Clang-iPhone7-GPU-GT7600-arm64-Debug-All" }
       builders {
         name: "Test-Debian9-Clang-NUC7i5BNK-GPU-IntelIris640-x86_64-Debug-All"
         experiment_percentage: 100