Rename the runtime linker namespace following ART/Runtime APEX split.

Remove the kludge in libnativeloader to deal with the inconsistency wrt the
name of the APEX package.

Test: Build & boot
Test: atest system/core/libnativeloader (on cf_x86_phone)
Bug: 139408016
Change-Id: I6115b49237c78c2ea4aa943ca4fe0b296b5a2b62
diff --git a/libnativeloader/public_libraries.h b/libnativeloader/public_libraries.h
index 2de4172..b892e6f 100644
--- a/libnativeloader/public_libraries.h
+++ b/libnativeloader/public_libraries.h
@@ -29,7 +29,7 @@
 // e.g., if it is a vendor app or not, different set of libraries are made available.
 const std::string& preloadable_public_libraries();
 const std::string& default_public_libraries();
-const std::string& runtime_public_libraries();
+const std::string& art_public_libraries();
 const std::string& vendor_public_libraries();
 const std::string& extended_public_libraries();
 const std::string& neuralnetworks_public_libraries();