Remove FP16 compiler workaround for riscv64. am: 265f4ec40e

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NeuralNetworks/+/2321687

Change-Id: I62325ef33893d68d985c63a47e865eb652289c06
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>