Update target.bzl to remove a comment (#19380)

This is an interim fix, as the follow up diffs will enable this flag to
sync internal states


cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils
@Sebastian-Larsson @robell

Author: psiddh

backends/arm/test/targets.bzl

@@ -3,7 +3,7 @@ load("@fbcode_macros//build_defs:python_pytest.bzl", "python_pytest")
 load("@bazel_skylib//lib:paths.bzl", "paths")
 load("@fbsource//xplat/executorch/build:runtime_wrapper.bzl", "runtime")
 
-_ENABLE_VGF = False  # Disabled: memfd_create blocked by seccomp on Sandcastle causes segfaults before Python pre-flight check can run
+_ENABLE_VGF = False
 
 def define_arm_tests():
     # TODO [fbonly] Add more tests