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

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

Change-Id: I3b0954d70cf283b2fe69f1a5b909d7795b33d2bd