Merge "Move libvr_hwc-hal and vr_hwc into system_ext" am: d37a1b47f0 am: ff78481d4e am: 65aa3cd174 am: 8b6d10b11d

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1502497

Change-Id: I3e408e768fd14de587b378a0a4d9bbc9d6aa8a23