NeuralNetworks: pin cpp_std to gnu++17 am: 9e136a0ea1 am: ca3f812b05 am: ef8ad3c496

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NeuralNetworks/+/2833230

Change-Id: Ib7054e5c593adf4c9db2a8e4c09bbf66b82497aa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>