Implement NN HAL for compilation caching.

Add three methods
- IDevice::isCachingSupported
- IDevice::prepareModelFromCache
- IPreparedModel::saveToCache

Bug: 119616526
Test: NeuralNetworksTest_static
Test: VtsHalNeuralnetworksV1_xTargetTest with 1.2 sample driver
Change-Id: If28ffe0be48bcb9f4715293fc1201c8d2dbeb946
Merged-In: If28ffe0be48bcb9f4715293fc1201c8d2dbeb946
(cherry picked from commit 89dfafb4)