Delete TARGET_CPU_VARIANT_RUNTIME. am: 60344f3e70

Original change: https://android-review.googlesource.com/c/device/google/gs101/+/3275074

Change-Id: I0179f9d89be6927bb0204d561cf83348635a5f2d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>