Rename linker greylist to exempt-list

Update language to comply with Android's inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code for reference

  #inclusivefixit

Bug: http://b/162536543
Test: device boots
Change-Id: Ia80fb2f3be6abdadbd061570d48a4ef0fefcfebc
diff --git a/libnativeloader/library_namespaces.cpp b/libnativeloader/library_namespaces.cpp
index 330903d..3ef50e3 100644
--- a/libnativeloader/library_namespaces.cpp
+++ b/libnativeloader/library_namespaces.cpp
@@ -297,7 +297,7 @@
   // racing here.
   auto app_ns = NativeLoaderNamespace::Create(
       namespace_name, library_path, permitted_path, parent_ns, is_shared,
-      target_sdk_version < 24 /* is_greylist_enabled */, also_used_as_anonymous);
+      target_sdk_version < 24 /* is_exempt_list_enabled */, also_used_as_anonymous);
   if (!app_ns.ok()) {
     return app_ns.error();
   }