Merge "Support riscv64 in stack tool, remove mips64" am: b3e82ffca0

Original change: https://android-review.googlesource.com/c/platform/development/+/2477638

Change-Id: I6f1006224fcd1b5204310a784469bcb9c0bd89d7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>