Add new export LLM config

Pull Request resolved: #11028




@imported-using-ghimport

Differential Revision: [D75263991](https://our.internmc.facebook.com/intern/diff/D75263991/)
ghstack-source-id: 288636930

Author: jackzhxng

examples/models/llama/config/TARGETS

@@ -0,0 +1,9 @@
+# Any targets that should be shared between fbcode and xplat must be defined in
+# targets.bzl. This file can contain fbcode-only targets.
+
+load("@fbsource//xplat/executorch/build:runtime_wrapper.bzl", "runtime")
+load(":targets.bzl", "define_common_targets")
+
+oncall("executorch")
+
+define_common_targets()