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This CL adds matching GN configs for all the public iOS master/builders. The
feature is not yet enabled, since the implementation of mb.py has a hack that
skips reading the config files for public iOS master/builders.

This CL makes two slight adjustments to the GN args:
  1) All gn configs that use goma now set
  'strip_absolute_paths_from_debug_symbols=true'. This matches every other
  platform. This breaks lldb-debugging, but that's not relevant for bot builds,
  and increases goma cache hit rates.
  2) The WebRTC FYI ios-simulator device now uses code-signing. This matches
  every other ios-simulator builder.

Bug: 951182
Change-Id: I7d6ce92f15b7751ade796156fda31f4235208b46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1562451
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649704}