[executorch] Delete the unused TestMemoryConfig target

pybindings was the only target depending on this, but it didn't actually use it.

Noticed this while tracking down users of the non-span HierarchicalAllocator ctor.

Differential Revision: [D49344929](https://our.internmc.facebook.com/intern/diff/D49344929/)

ghstack-source-id: 200970943
Pull Request resolved: #390

Author: dbort

extension/pybindings/pybindings.cpp

@@ -26,7 +26,6 @@
 #include <executorch/runtime/platform/profiler.h>
 #include <executorch/runtime/platform/runtime.h>
 #include <executorch/schema/bundled_program_schema_generated.h>
-#include <executorch/util/TestMemoryConfig.h>
 #include <executorch/util/bundled_program_verification.h>
 #include <executorch/util/read_file.h>
 

shim/xplat/executorch/extension/pybindings/pybindings.bzl

@@ -18,7 +18,6 @@ PORTABLE_MODULE_DEPS = [
     "//executorch/extension/data_loader:buffer_data_loader",
     "//executorch/extension/data_loader:mmap_data_loader",
     "//executorch/extension/memory_allocator:malloc_memory_allocator",
-    "//executorch/util:test_memory_config",
     "//executorch/util:util",
     "//executorch/runtime/executor/test:test_backend_compiler_lib",
 ] + get_all_cpu_backend_targets()
@@ -32,7 +31,6 @@ ATEN_MODULE_DEPS = [
     "//executorch/extension/data_loader:mmap_data_loader",
     "//executorch/extension/memory_allocator:malloc_memory_allocator",
     "//executorch/util:read_file",
-    "//executorch/util:test_memory_config",
     "//executorch/util:bundled_program_verification_aten",
     "//caffe2:torch",
     "//caffe2:torch_extension",

util/TestMemoryConfig.h

@@ -7,20 +7,6 @@ def define_common_targets():
     TARGETS and BUCK files that call this function.
     """
 
-    runtime.cxx_library(
-        name = "test_memory_config",
-        srcs = [],
-        exported_headers = ["TestMemoryConfig.h"],
-        visibility = [
-            "//executorch/...",
-            "@EXECUTORCH_CLIENTS",
-        ],
-        deps = [
-            "//executorch/runtime/core:core",
-            "//executorch/runtime/core:memory_allocator",
-        ],
-    )
-
     runtime.cxx_library(
         name = "read_file",
         srcs = ["read_file.cpp"],