Add @1.2::IPreparedModel::executeSynchronously() and corresponding VTS tests.

Bug: 119274127

Test: all of the following, with the appropriate android.hardware.neuralnetworks@1.${X}::IDevice/sample-all
    VtsHalNeuralnetworksV1_0TargetTest
    VtsHalNeuralnetworksV1_0TargetTest
    VtsHalNeuralnetworksV1_1CompatV1_0TargetTest
    VtsHalNeuralnetworksV1_1CompatV1_0TargetTest
    VtsHalNeuralnetworksV1_1TargetTest
    VtsHalNeuralnetworksV1_1TargetTest
    VtsHalNeuralnetworksV1_2CompatV1_0TargetTest
    VtsHalNeuralnetworksV1_2CompatV1_0TargetTest
    VtsHalNeuralnetworksV1_2CompatV1_1TargetTest
    VtsHalNeuralnetworksV1_2CompatV1_1TargetTest
    VtsHalNeuralnetworksV1_2TargetTest
    VtsHalNeuralnetworksV1_2TargetTest

Change-Id: Iedfa485b4008d9cec3b81ff4c0ce3ebc0b83c823