Merge "Add riscv64 support" am: 75e9f62078

Original change: https://android-review.googlesource.com/c/platform/external/aac/+/2171525

Change-Id: I4d5851ffc1e5e1892ec83209045ccf3bf4b188cb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>