Remove legacy ART APEX linker configuration file.

This file is no longer needed, as the ART APEX linker configuration
file is now generated by `linkerconfig` in all environments.

Test: Run ART tests on device in chroot environment
Bug: 149376737
Change-Id: I79135e4ce92eb1cae69a8f5f3c2b41e05c321f51
2 files changed