Merge "Add perf register definition for riscv64" am: 7d7871f0a6

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/2252054

Change-Id: I7d8a274d4ad3b8b99188ac64912ac2343021b5c1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>