Remove unused `libnanohub_os_neonkey`. am: 8d6c067b55

Original change: https://android-review.googlesource.com/c/device/google/contexthub/+/3078749

Change-Id: I59fb450ae0ee566ffec854d8e48cbcb4e135e14c
Signed-off-by: Automerger Merge Worker <[email protected]>