Merge "riscv64: remove some obsolete #if cruft." into main am: df0b557e09 am: e717251be9

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2896304

Change-Id: Id573633c780dde76c6653a84f36f39bd1dd5783a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>