PRESUBMIT: Add new trybots for iOS Simulator

Trybots added in https://codereview.chromium.org/1096683002

BUG=chromium:478057
R=phoglund@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/49049004

Cr-Commit-Position: refs/heads/master@{#9031}
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 7a51859..55e7e06 100755
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -334,6 +334,8 @@
       'ios_arm64',
       'ios_arm64_rel',
       'ios_rel',
+      'ios32_sim',
+      'ios64_sim',
   ]
   linux_gn_bots = [
       'linux_gn',