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

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

Change-Id: I886751d803e90f7d678b3142748d87e23256e646
Signed-off-by: Automerger Merge Worker <[email protected]>