Merge "Add riscv64 banchan target." am: 40b9ac7e am: 6270916e am: 975e0ef2 am: 1f4f71f0

Original change: https://android-review.googlesource.com/c/platform/build/+/2622111



Change-Id: I7199b35c333b014d0099711590e7458080d4a8e0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>