[automerger skipped] FL7: Add MIRROR_PAD CPU reference implementation and functional testing am: e7253cf29b am: e5b8f3dea0 -s ours

am skip reason: Merged-In Ib2b310365e76364bb7c2fa56cb73b0a788e23123 with SHA-1 a0e7d007bf is already in history

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NeuralNetworks/+/1956741

Change-Id: I570b8d9b56f46e6867f7dbc825aa17972bb9035c
Signed-off-by: Automerger Merge Worker <[email protected]>