Add checkout_fuchsia_for_arm64_host to DEPS

This should hopefully fix V8 DEPS upgrade.

Bug: chromium:1137662,chromium:1080854
Change-Id: If069e4ea567a023006472371177ff7b32737153a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2476654
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70548}

DEPS

@@ -6,6 +6,9 @@ use_relative_paths = True
 
 gclient_gn_args_file = 'build/config/gclient_args.gni'
 gclient_gn_args = [
+  # TODO(https://crbug.com/1137662, https://crbug.com/1080854)
+  # Remove when migration is complete.
+  'checkout_fuchsia_for_arm64_host',
   'checkout_google_benchmark',
   'mac_xcode_version',
 ]
@@ -26,6 +29,12 @@ vars = {
   # Wildcards are supported (e.g. "qemu.*").
   'checkout_fuchsia_boot_images': "qemu.x64,qemu.arm64",
 
+  # TODO(https://crbug.com/1137662, https://crbug.com/1080854)
+  # Remove when migration is complete.
+  # By default, do not check out files required to run fuchsia tests in
+  # qemu on linux-arm64 machines.
+  'checkout_fuchsia_for_arm64_host': False,
+
   'checkout_instrumented_libraries': False,
   'checkout_ittapi': False,
   # Fetch clang-tidy into the same bin/ directory as our clang binary.