Make flex:delegate_data, init_tensorflow.h and init_tensorflow.cc visible for selective registration uses

PiperOrigin-RevId: 314099714
Change-Id: I2da62c0817475cfd268608f2ff32e8ed1a531310

tensorflow/lite/delegates/flex/BUILD

@@ -129,6 +129,7 @@ cc_library(
     name = "delegate_data",
     srcs = ["delegate_data.cc"],
     hdrs = ["delegate_data.h"],
+    visibility = ["//visibility:public"],
     deps = [
         ":buffer_map",
         "@com_google_absl//absl/memory",

tensorflow/lite/testing/BUILD

@@ -25,6 +25,8 @@ package(
 exports_files([
     "generated_examples_zip_test.cc",
     "tflite_diff_example_test.cc",
+    "init_tensorflow.h",
+    "init_tensorflow.cc",
 ])
 
 [gen_zip_test(