Delete TARGET_CPU_VARIANT_RUNTIME. am: 60344f3e70 am: 161a602a62

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

Change-Id: I3e2fadf317006f0e2e1aa4eeca222995a52d07e9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>