riscv64: disable a weird option. am: bee01f7d

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2853594



Change-Id: I5d38048a2be038b68f19df318e215c1c4d468b85
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>