Update base for Update on "[ET Device Support] Add NonConstBufferDevice schema for per-buffer device mapping"

Adds the NonConstBufferDevice table to the FlatBuffer schema (program.fbs) and the
corresponding Python dataclass to schema.py. This enables mapping each non-constant
planned memory buffer to a specific device type (CPU, CUDA, etc.).

The field is optional and absent for CPU-only programs, ensuring zero binary size regression.

Differential Revision: [D97335597](https://our.internmc.facebook.com/intern/diff/D97335597/)

[ghstack-poisoned]

Author: Gasoonjia

runtime/core/targets.bzl

@@ -91,7 +91,7 @@ def define_common_targets():
         exported_deps = [
             ":core",
             ":memory_allocator",
-            "//executorch/runtime/core/portable_type:portable_type",
+            "//executorch/runtime/core/exec_aten:lib",
         ],
         visibility = ["PUBLIC"],
     )