[automerger skipped] Make System.nanoTime and currentTimeMillis CriticalNative. am: 63fafb1fc5 am: 9c36c92223 am: b7ccc7acc3 -s ours

am skip reason: Change-Id I4909fcd6f3af09a03ee6388ea58b92826b4bbfbc with SHA-1 63fafb1fc5 is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/libcore/+/11078199

Change-Id: I6de1a316dba90c48a0a5d6b4afeed9ee31a49841